五年级上脱式计算题有答案急！！！！！！！！！

五年级脱式计算题~

5.4÷1.8+240×1.5
9000÷72×(1.25×0.7×8)
61-(1.25+2.5×0.7)
[(10-0.8)+9.85]-2÷0.125
3^2*3.25678
3^3-5
12+5268.32-2569
123+456-52*8
789+456-78
181+2564）+2719
378+44+114+242+222
276+228+353+219
(375+1034)+(966+125)
(2130+783+270)+1017
99+999+9999+99999
7755－(2187+755)
2214+638+286
3065－738－1065
138×25×4
(13×125)×(3×8)
(12+24+80)×5025×32×125
32×(25+125)
178×101－178
84×36+64×84
75×99+2×75
83×102－83×2
123×18－123×3+85×123
50×(34×4)×3
25×（24+16）
178×99+178
79×42+79+79×57
7300÷25÷4
8100÷4÷75
158+262+138
375+219+381+225
5001－247－1021－232
（181+2564）+2719
378+44+114+242+222
276+228+353+219
(375+1034)+(966+125)
(2130+783+270)+1017
99+999+9999+99999
7755－(2187+755)
2214+638+286
3065－738－1065
2357－183－317－357
2365－1086－214
138×25×4
(13×125)×(3×8)
(12+24+80)×50
25×32×125
32×(25+125)
178×101－178
84×36+64×84
75×99+2×75
83×102－83×2
123×18－123×3+85×123
50×(34×4)×3
25×（24+16）
178×99+178
79×42+79+79×57
7300÷25÷4
8100÷4÷75
2356－（1356－721）
1235－（1780－1665）
75×27+19×2 5
31×870+13×310
4×(25×65+25×28)
2.73 ＋ 0.89 ＋ 1.27
4.37 ＋ 0.28 ＋ 1.63 ＋ 5.72
10 － 0.432 － 2.568
9.3 － 5.26 － 2.74
13.4－（3.4＋5.2）
14.9－（5.2＋4.9）
18.32 － 5.47 － 4.32
17.29 － 5.28 － 6.29
25 × 6.8 × 0.04
0.25 × 32 × 0.125
6.4 × 1.25 × 12.5
3.28 × 5.7 ＋ 6.72 × 5.7
2.1 × 99 ＋ 2.1
1.7 × 9.9 ＋ 0.17
23 × 0.1 ＋ 2.3 × 9.9
0.18 ＋4.26 －0.18 ＋4.26
0.58 ×1.3 ÷ 0.58 ×1.3
7.3 ÷4 ＋ 2.7 × 0.25
3.75 × 0.5 － 2.75 ÷ 2
5.26 × 0.125 ＋ 2.74 ÷ 8
9.5 ÷（1.9 × 8）
12.8 ÷ （0.4 × 1.6）
930 ÷ 0.6 ÷5
63.4 ÷ 2.5 ÷ 0.4
（7.7 ＋ 1.54）÷ 0.7
（11.7 ＋ 9.9）÷ 0.9
6.9＋4.8＋3.1
15.89＋(6.75－5.89)
7.85＋2.34－0.85＋4.66
35.6－1.8－15.6－7.2
13.75－(3.75＋6.48)
47.8－7.45+2.55
66.86－8.66－1.34
0.25×16.2×4
0. 25×32 ×0.125
2 .5 ×(4 +0.4)
(1.25－0.125)×8
56.5×9.9＋56.5
5.4×11-5.4
3.83×4.56＋3.83×5.44
7.09×10.8－0.8×7.09
3.65×4.7－36.5×0.37
13.7×0.25－3.7÷4
10.7×16.1-1.1×10.7 +10.7 ×5
3.9÷（1.3×5）
63.4÷2.5÷0.4
（7.7＋1.4）÷0.7
18 ÷ （2+9）
57.26－(5.26－1.5)


106.25+3.85－2.125+3.875


11.9－2456×21


5/11－4×2.75


13.375+5.75+2.25+6.625


（15.1－9036）÷18


163.8×5.25+14.5


172.1×4.3+5.7×2.1


19.102×45-328


2.8×3.1+16/8


23÷(50-12.5) ÷2.5


24×2/5×1/3


25.6÷110×47+639


3.5×2.7-52.2/18


28－1/7×1/5


3.375×0.97+0.97×6.625


6.54+2.4+3.46+0.6


95.6×1.8+95.6×8.2


35.6－420/12×4


344/3.6-5.4×0.25


16/2+30/2+90/6


5000-105×34


0.15/0.25+0.75×1.2


41×(1/2+1/3+1/4)×0.24


42×(25+4)×4


3×63/21－84


0.81/0.25+5.96×5


403÷13×27


46.1.5×4.2－0.75÷0.25
3.27×4 +3.27×5.7


（1.2+ 1.8）×4.51025－768÷32


0.25×80－0.45÷0.9


50.1025－768÷32


81.2－11÷7－×3=


6696÷62－6.5×10.6 =


2/7×3/9 ÷2/7 =


6756－193－207=

97×360＋3×360=

这些行吗

/ =除号 *=乘号
11/14-3/14+1/8
=4.05-(2.8+0.7)
=0.55

4.05-2.8-0.7
=4.05-(2.8+0.7)
=0.55

212+198
=(200+12)+(100+98)
=200+12+100+98
=12+98+100+200
=110+100+200
=410

13.75-(3.75+6.48)
=13.75-3.75-6.48
=10-6.48
=3.52

（0.75*42.7+57.3-0.573*25）/3*7972
=(0.75*42.7+57.3*1-57.3*0.25)/3*7972
=[0.75*42.7+57.3(1-0.25)]/3*7972
=[0.75*42.7+57.3*0.75]/3*7972
=[(42.7+57.3)*0.75]/3*7972
=75/3*7972
=25*7972
=199300

3.45*0.6*2.8=3.45×2.8×0.6=5.796

4.02＋5.4＋0.98
=4.02+0.98+5.4
=5+5.4
=10.4
5.17－1.8－3.2
=5.17-（1.8+3.2）
=5.17-5
=0.17

13.75－(3.75＋6.48)
=13.75-3.75-6.48
=3.52

33*145+33*55
=(145+55)*33
=200*33
=6600

369*136-36*369
=100*369
=36900

193*51+193*49
=100*193
=19300


25*32
=25*4*8
=800

79*16+79*78+79*6
=(16+78+6)*79
=100*79
=7900

25*32
=25*4*8
=800

193*51+193*49
=100*193
=19300

369*136-36*369
=100*369
=36900

33*145+33*55
=(145+55)*33
=200*33
=6600
1.45+15×6= 135
2.250÷5×8=400
3.6×5÷2×4=60
4.30×3+8=98
5.400÷4+20×5= 200
6.10+12÷3+20=34
7.(80÷20+80)÷4=21
8.70+(100-10×5)=120
9.360÷40+10= 19
10.40×20-200= 600
11.（80-25）*2= 110
12.70+45=115
13.90×2÷3= 60
14.16×6÷3= 32
15.300×6÷9= 200
16.540÷9×7=420
17.30×20÷15= 20
18.400÷4×7= 700
19.（350-80）÷9= 30
20.160+70+50=280
21.18-64÷8= 10
22.42÷6+20=27
23.40-5×7= 5
24.80+60÷3=100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80=70
29.25×16÷4= 100
30.120×25÷5= 600
31.36×11÷3= 132
32.1025÷25×8=328
33.336+70-6= 400
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010=2010
37.12×50+10= 610
38.25×8+199= 399
39.23×11-13= 240
40.125÷25-5=0
41.4200-2200+200=2200
42.220+80-150=150
43.20×8×5= 800
44.600-3×200=0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4

1）25%*132+1/4*8 2)32*0.125*25
=1/4*132+1/4*8 =(4+8)*0.125*25
=1/4*(132+8) =(4*25)*(8*0.125)
=1/4*140 =100*1
=35 =1000
3)75%*76+25*4+0.75*12
=3/4*76+3/4*12+25*4
=3/4*88+100
=166
4)3200*1/8÷2/5+1270 5)(2/3+4/5)*7/6
=400*5/2+1270 =22/15*7/6
=1000+1270 =77/45
=2270
5)6*(1/2+2/3) 6)132*(44÷176)
=6*1/2+6*2/3 =132*1/4 =33
=3+4
=7
7)72.25%*99+75.25%
=75.25%*99+75.25%*1
=75.25%*(99+1)
=75.25%*100
=75.25


①2700×（506－499）÷900 ②33.02－（148.4－90.85）÷2.5
=2700×7÷900 =33.02－57.55÷2.5
=18900÷900 =33.02－23.02
=21 =10

③（1÷1－1）÷5.1 ④18.1＋（3－0.299÷0.23）×1
=（1－1）÷5.1 =18.1＋1.7X1
=0÷5.1 =18.1＋1.7
=0 =19.8
例1：用简便方法计算下面各题. +4yre^gC
(1)0.25×3.6 (2)10.8×1.25 (3) 0.6×0.25×0.4 (4)20×0.63×0.5 8 063LWV
_[rFnyC+0V
解： A]c
'T T@6
(1)0.25×3.6 8N&' n
=0.25×(4×0.9) W.3b]zcV
=(0.25×4)×0.9 1 Uup.(
=1×0.9 Kq[4I[+R
=0.9 (2)10.8×1.25 a0NiVF-m%
=(10＋0.8)×1.25 '0 Cp
=10×1.25＋0.8×1.25 1L,L/sOwB&
=12.5＋1 +b 6R \b
=13.5
分析：上面两道题都不能直接应用乘法的运算定律和性质进行简算.但是，可以根据原题特征和数据特点，分解某一个因数，再经过适当的变换，计算起来就比较简便.而（3）、（4）两题则可以利用交换率、结合率进行简算 :k\#=u(

解： pGD@R=8
(3)0.6×0.25×0.4 =(0.25×0.4)×0.6 i q`}c |c
=0.1×0.6 T'pL&@,Q
=0.06 ROFZ*@CH<
(4)20×0.63×0.5 =(20×0.5)×0.63 9FDu{4:
=10×0.63 |aDBp
=6.3 "
{~5QO 


我们前面已经学习和掌握了一个数乘以整十、整百……的数，算起来非常简便.为此，应用“一个因数扩大几倍(零除外)，另一个因数缩小同一倍数，它们的积不变”这条规律，也可以使一些小数乘法计算简便. *}\M!u{J
例2 (1)1.25×5.6 (2)48×0.25 (3) 0.279×343+0.657×279 d-b04Q7DQ
(4) 314×0.043+3.14×7.2 - 31.4×0.15 （5）3.9×1.2+0.12 !<M eWo
解： {KgA V
(1)1.25×5.6 =(1.25×8)×(5.6÷8) nJe}U#\b
=10×0.7 Q]9$dr=Kk0
=7 ZA="Dac
(2)48×0.25 =(48÷4)×(0.25×4) 3y)\dln
=12×1 Z1 Nep !
=12 CY o m


分析：以上两题利用积不变规律就可以解决，另外也可以将其中一个乘数分解出某一因数，此因数与另一乘数之积为整十、整百来计算。即 *$=i1w
(1)1.25×5.6 =1.25×8×0.7 V\b}V->j*
=10×0.7 2u$-(JfoS
=7 [oh06_rB
(2)48×0.25 =12 ×（4×0.25) c~hH 7/v
=12×1 $!O@Z8B
=12 mn@1&#c4y


　
（3）0.279×343+0.657×279 =279×0.343+0.657×279 8$NVVw]2,
=279×（0.343+0.657） dWd%>9 }
=279×1 )M0`dy{1
=279 ]r;rAOWVV
(4) 314×0.043+3.14×7.2 - 31.4×0.15 =31.4×0.43+31.4×0.72 - 31.4×0.15 r<0E[ ~
=31.4×（0.43+0.72 - 0.15） #}#m\=0
=31.4×1 ins(RWO
=31.4 IRbyW?/Xv


（5）3.9×1.2+0.12 r6\bF TpOF
=3.9×1.2+1.2×0.1 ZSu.0|0#
=1.2×（3.9+0.1） 3A,N1OXG
=1.2×4 "=a3"/u
=4.8 /[TOy2/;%b
分析：解答这两道题的关键是把0.279、279；314、3.14和31.4等这几个数统一成一个相同的数，另一个因数根据积不变规律进行变化，然后就可以根据运算定律进行简算。 Xy(QK2|

练习题
1．用简便方法计算下面各题. Vq3NjN!+5
(1)1.25×7×0.8 (2)0.25×0.8×4 k1,k 9BK
(3)0.8×0.14×0.125(4)0.2×1.6×0.5×10 L
$=R/l
(5)7.8×5×0×3.8(6)3.2×0.125×25 5.^pD9[mT
(7)7.4×0.99(8)4.5×1.02 QD.5o
S
(9)2.5×1.25×4×8(10)101×5.3 K
#A&
(11)3.2×1.25(12)0.125×32×2.5 2xN7lfu1RB
2、用简便方法计算下面各题. <lB2Nv-,
（1）75×4.7+15.9×25 b=Nsz$[
（2）28.67×67+32×28.67+573.4×0.05 u [qy1M0
（3）172.4×6.2+1724×0.38 -=lm`X<:
（4）3.12+31.2×9.9 B <s+I#
3、（1）计算 gp9O%g3'


1、（1）——（6）7、 0.8、 0.014、 1.6、 0、 10、 u\b8 k^\Do
（7）——（12）6.66、 4.59、 100、 535.3、4、10 b#I,Z+0ry
2、 9-n]_AF`0
（1）提示：75×4.7+15.9×25=25×3×4.7+15.9×25=25×（14.1+15.9）=750 9]3l'
（2）28.67×67+32×28.67+573.4×0.05=28.67×67+32×28.67+28.67=28.67×100=2867 ANPG\b3^w
（3）172.4×6.2+1724×0.38=1724×（0.62+0.38）=1724 f
#h0O3
（4）3.12+31.2×9.9=31.2×（0.1+9.9）=312 `x=
kb;
3、（1）181×11=1991小数点后共有963+1028+3+2—4=1992个0。 ]}SV%*{ %
最后答案 =3,<(F5Y[


/ =除号 *=乘号

下面参考资料还有别的脱式计算

408－12×24 = 408 - 288 = 120
（46＋28）×60 = 74 x 60 = 4440
42×50－17 = 2100- 17 = 2083
32＋105÷5 = 32 + 21 = 53
420×（327－238） = 420 x 89 = 37380
(4121+2389)÷7 = 6510 ÷7 = 930
3.416÷（0.016×35） = 3.416 ÷0.56 = 6.1
0.8×[(10－6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16
5.67×0.2-0.62 = 1.134-0.62 = 0.514
0.4×0.7×0.25 = 0.4 x 0.25 x 0.7 = 0.1 x 0.7 = 0.07

0.78+5.436+1 = 6.216 +1 = 7.216
30.8÷[14－(9.85＋1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10
[60－(9.5＋28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120
2.881÷0.43－0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86
20×[(2.44－1.8)÷0.4＋0.15] = 20x (0.64 ÷0.4 +0.15)= 20x(1.6 +0.15) = 20 x1.75 = 35
28-(3.4+1.25×2.4) = 28 - (3.4 + 3) = 28 - 6.4 = 21.6
2.55×7.1+2.45×7.1 = (2.55 + 2.45) x7.1 = 5 x7.1=35.5
0.8×〔15.5-(3.21+5.79)〕 = 0.8 x (15.5 - 9) = 0.8 x 6.5 = 5.2
（31.8+3.2×4）÷5 = (31.8 + 12.8)÷5 = 44.6÷5 = 8.92
31.5×4÷(6+3) = 126 ÷ 9 = 14

2÷2.5+2.5÷2 = 0.8 + 1.25 =2.05
194－64.8÷1.8×0.9 = 194 -36 x0.9 = 194-32.4 = 161.65180－705×6 = 5180 - 4230=950
24÷2.4－2.5×0.8 =10 -2=8
405×(3213-3189) =405x24 = 9720
125×(97-81) =125x16 =2000
6942+480÷3 = 6942 + 160 = 6782
20+80÷4-20 = 20 + 20 -20 = 40 -20 = 20
100÷（32-30）×0 = 100 ÷2 x0= 50 x0 = 0
25×4-12×5 = 100 - 60 = 40

70×〔（42-42）÷18〕=70 x (0÷18) = 70x0 = 0
75×65+75×35 = 75 x (65 +35) = 75x100 = 7500
6-1.6÷4= 6- 0.4 = 5.6
5.38+7.85-5.37= 13.23 - 5.37=7.86
7.2÷0.8-1.2×5=9 - 6 =3
6-1.19×3-0.43= 6-3.57 - 0.43 = 6- (3.57 + 0.43) = 6-4 = 2
6.5×（4.8-1.2×4）= 6.5 x(4.8 - 4.8 )=6.5 x0 = 0
0.68×1.9+0.32×1.9 = (0.68 + 0.32) x1.9 = 1 x 1.9 = 1.9
10.15-10.75×0.4-5.7 = 10.15 - 4.3 - 5.7 = 10.15 -(4.3 + 5.7)=10.15 - 10 =0.15
5.8×（3.87-0.13）+4.2×3.74 = 5.8 x 3.74 +4.2 x 3.74 = (5.8 +4.2)x3.74 = 10 x 3.74 = 37.4

32.52-（6+9.728÷3.2）×2.5 = 32.52 - (6+3.04)x2.5 = 32.52 - 9.02 x 2.5 = 32.52 -22.55 = 9.97
（136+64）×（65-345÷23）= 200x(65-15) = 200x 50=10000

408－12×24 = 408 - 288 = 120
（46＋28）×60 = 74 x 60 = 4440
42×50－17 = 2100- 17 = 2083
32＋105÷5 = 32 + 21 = 53
420×（327－238） = 420 x 89 = 37380
(4121+2389)÷7 = 6510 ÷7 = 930
3.416÷（0.016×35） = 3.416 ÷0.56 = 6.1
0.8×[(10－6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16
5.67×0.2-0.62 = 1.134-0.62 = 0.514
0.4×0.7×0.25 = 0.4 x 0.25 x 0.7 = 0.1 x 0.7 = 0.07

0.78+5.436+1 = 6.216 +1 = 7.216
30.8÷[14－(9.85＋1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10
[60－(9.5＋28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120
2.881÷0.43－0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86
20×[(2.44－1.8)÷0.4＋0.15] = 20x (0.64 ÷0.4 +0.15)= 20x(1.6 +0.15) = 20 x1.75 = 35
28-(3.4+1.25×2.4) = 28 - (3.4 + 3) = 28 - 6.4 = 21.6
2.55×7.1+2.45×7.1 = (2.55 + 2.45) x7.1 = 5 x7.1=35.5
0.8×〔15.5-(3.21+5.79)〕 = 0.8 x (15.5 - 9) = 0.8 x 6.5 = 5.2
（31.8+3.2×4）÷5 = (31.8 + 12.8)÷5 = 44.6÷5 = 8.92
31.5×4÷(6+3) = 126 ÷ 9 = 14

2÷2.5+2.5÷2 = 0.8 + 1.25 =2.05
194－64.8÷1.8×0.9 = 194 -36 x0.9 = 194-32.4 = 161.65180－705×6 = 5180 - 4230=950
24÷2.4－2.5×0.8 =10 -2=8
405×(3213-3189) =405x24 = 9720
125×(97-81) =125x16 =2000
6942+480÷3 = 6942 + 160 = 6782
20+80÷4-20 = 20 + 20 -20 = 40 -20 = 20
100÷（32-30）×0 = 100 ÷2 x0= 50 x0 = 0
25×4-12×5 = 100 - 60 = 40

70×〔（42-42）÷18〕=70 x (0÷18) = 70x0 = 0
75×65+75×35 = 75 x (65 +35) = 75x100 = 7500
6-1.6÷4= 6- 0.4 = 5.6
5.38+7.85-5.37= 13.23 - 5.37=7.86
7.2÷0.8-1.2×5=9 - 6 =3
6-1.19×3-0.43= 6-3.57 - 0.43 = 6- (3.57 + 0.43) = 6-4 = 2
6.5×（4.8-1.2×4）= 6.5 x(4.8 - 4.8 )=6.5 x0 = 0
0.68×1.9+0.32×1.9 = (0.68 + 0.32) x1.9 = 1 x 1.9 = 1.9
10.15-10.75×0.4-5.7 = 10.15 - 4.3 - 5.7 = 10.15 -(4.3 + 5.7)=10.15 - 10 =0.15
5.8×（3.87-0.13）+4.2×3.74 = 5.8 x 3.74 +4.2 x 3.74 = (5.8 +4.2)x3.74 = 10 x 3.74 = 37.4

32.52-（6+9.728÷3.2）×2.5 = 32.52 - (6+3.04)x2.5 = 32.52 - 9.02 x 2.5 = 32.52 -22.55 = 9.97
（136+64）×（65-345÷23）= 200x(65-15) = 200x 50=10000

不知道408－12×24 = 408 - 288 = 120
（46＋28）×60 = 74 x 60 = 4440
42×50－17 = 2100- 17 = 2083
32＋105÷5 = 32 + 21 = 53
420×（327－238） = 420 x 89 = 37380
(4121+2389)÷7 = 6510 ÷7 = 930
3.416÷（0.016×35） = 3.416 ÷0.56 = 6.1
0.8×[(10－6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16
5.67×0.2-0.62 = 1.134-0.62 = 0.514
0.4×0.7×0.25 = 0.4 x 0.25 x 0.7 = 0.1 x 0.7 = 0.07

0.78+5.436+1 = 6.216 +1 = 7.216
30.8÷[14－(9.85＋1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10
[60－(9.5＋28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120
2.881÷0.43－0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86
20×[(2.44－1.8)÷0.4＋0.15] = 20x (0.64 ÷0.4 +0.15)= 20x(1.6 +0.15) = 20 x1.75 = 35

408－12×24 = 408 - 288 = 120
（46＋28）×60 = 74 x 60 = 4440
42×50－17 = 2100- 17 = 2083
32＋105÷5 = 32 + 21 = 53
420×（327－238） = 420 x 89 = 37380
(4121+2389)÷7 = 6510 ÷7 = 930
3.416÷（0.016×35） = 3.416 ÷0.56 = 6.1
0.8×[(10－6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16
5.67×0.2-0.62 = 1.134-0.62 = 0.514
0.4×0.7×0.25 = 0.4 x 0.25 x 0.7 = 0.1 x 0.7 = 0.07

0.78+5.436+1 = 6.216 +1 = 7.216
30.8÷[14－(9.85＋1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10
[60－(9.5＋28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120
2.881÷0.43－0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86
20×[(2.44－1.8)÷0.4＋0.15] = 20x (0.64 ÷0.4 +0.15)= 20x(1.6 +0.15) = 20 x1.75 = 35
28-(3.4+1.25×2.4) = 28 - (3.4 + 3) = 28 - 6.4 = 21.6
2.55×7.1+2.45×7.1 = (2.55 + 2.45) x7.1 = 5 x7.1=35.5
0.8×〔15.5-(3.21+5.79)〕 = 0.8 x (15.5 - 9) = 0.8 x 6.5 = 5.2
（31.8+3.2×4）÷5 = (31.8 + 12.8)÷5 = 44.6÷5 = 8.92
31.5×4÷(6+3) = 126 ÷ 9 = 14

2÷2.5+2.5÷2 = 0.8 + 1.25 =2.05
194－64.8÷1.8×0.9 = 194 -36 x0.9 = 194-32.4 = 161.65180－705×6 = 5180 - 4230=950
24÷2.4－2.5×0.8 =10 -2=8
405×(3213-3189) =405x24 = 9720
125×(97-81) =125x16 =2000
6942+480÷3 = 6942 + 160 = 6782
20+80÷4-20 = 20 + 20 -20 = 40 -20 = 20
100÷（32-30）×0 = 100 ÷2 x0= 50 x0 = 0
25×4-12×5 = 100 - 60 = 40

70×〔（42-42）÷18〕=70 x (0÷18) = 70x0 = 0
75×65+75×35 = 75 x (65 +35) = 75x100 = 7500
6-1.6÷4= 6- 0.4 = 5.6
5.38+7.85-5.37= 13.23 - 5.37=7.86
7.2÷0.8-1.2×5=9 - 6 =3
6-1.19×3-0.43= 6-3.57 - 0.43 = 6- (3.57 + 0.43) = 6-4 = 2
6.5×（4.8-1.2×4）= 6.5 x(4.8 - 4.8 )=6.5 x0 = 0
0.68×1.9+0.32×1.9 = (0.68 + 0.32) x1.9 = 1 x 1.9 = 1.9
10.15-10.75×0.4-5.7 = 10.15 - 4.3 - 5.7 = 10.15 -(4.3 + 5.7)=10.15 - 10 =0.15
5.8×（3.87-0.13）+4.2×3.74 = 5.8 x 3.74 +4.2 x 3.74 = (5.8 +4.2)x3.74 = 10 x 3.74 = 37.4

32.52-（6+9.728÷3.2）×2.5 = 32.52 - (6+3.04)x2.5 = 32.52 - 9.02 x 2.5 = 32.52 -22.55 = 9.97
（136+64）×（65-345÷23）= 200x(65-15) = 200x 50=10000

1）25%*132+1/4*8 2)32*0.125*25
=1/4*132+1/4*8 =(4+8)*0.125*25
=1/4*(132+8) =(4*25)*(8*0.125)
=1/4*140 =100*1
=35 =1000
3)75%*76+25*4+0.75*12
=3/4*76+3/4*12+25*4
=3/4*88+100
=166
4)3200*1/8÷2/5+1270 5)(2/3+4/5)*7/6
=400*5/2+1270 =22/15*7/6
=1000+1270 =77/45
=2270
5)6*(1/2+2/3) 6)132*(44÷176)
=6*1/2+6*2/3 =132*1/4 =33
=3+4
=7 1）25%*132+1/4*8 2)32*0.125*25
=1/4*132+1/4*8 =(4+8)*0.125*25
=1/4*(132+8) =(4*25)*(8*0.125)
=1/4*140 =100*1
=35 =1000
3)75%*76+25*4+0.75*12
=3/4*76+3/4*12+25*4
=3/4*88+100
=166
4)3200*1/8÷2/5+1270 5)(2/3+4/5)*7/6
=400*5/2+1270 =22/15*7/6
=1000+1270 =77/45
=2270
5)6*(1/2+2/3) 6)132*(44÷176)
=6*1/2+6*2/3 =132*1/4 =33
=3+4
=7

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