计算下面各题,能简算的要用简便方法计算...........
(2)运用加法交换律和结合律、以及乘法分配律,原式变为(38+27)×1.25+15÷[4/5],把1.25化为分数,然后运用乘法分配律的逆运算简算;
(3)根据数字特点,运用乘法分配律的逆运算简算;
(4)根据乘法分配律简算;
(5)运用乘法分配律计算,原式变为[3/8]×16+[1/27]×16+[11/27],再运用乘法分配律的逆运算计算[1/27]×16+[11/27];
(6)把除法改为乘法,再运用乘法分配律的逆运算简算.
(1)4÷[4/5]-[4/5]÷4,
=4×[5/4]-[4/5]×[1/4],
=5-[1/5],
=4[4/5];
(2)38×1.25+15÷80%+1.25×27,
=(38+27)×1.25+15÷[4/5],
=65×[5/4]+15×[5/4],
=(65+15)×[5/4],
=80×[5/4],
=100;
(3)[1/8]×58+[1/8]×41+[1/8],
=(58+41+1)×[1/8],
=100×[1/8],
=12.5;
(4)13×([2/13]+[2/11]×11),
=13×([2/13]+2),
=13×[2/13]+13×2,
=2+26,
=28;
(5)([3/8]+[1/27])×16+[11/27],
=[3/8]×16+[1/27]×16+[11/27],
=6+([16/27]+[11/27]),
=6+1,
=7.
,4,计算下面各题,能简算的要用简便方法算.
4÷[4/5]-[4/5]÷4 38×1.25+15÷80%+1.25×27 [1/8]×58+[1/8]×41+[1/8] 13×([2/13]+[2/11]×11 ) ([3/8]+[1/27])×16+[11/27] [3/7]×[1/15]+[4/7]÷15.
计算下面各题,能简算的要简算. ①4.28-1.39-2.61 ②7.2×0.3+0.3×0.8...
(1)4.28-1.39-2.61,=4.28-(1.39+2.61),=4.28-4,=0.28;(2)7.2×0.3+0.3×0.8,=(7.2+0.8)×0.3,=8×0.3,=2.4;(3)0.4×3.14×2.5,=0.4×2.5×3.14,=1×3.14,=3.14;(4)9.4×[3.6÷(5.4÷0.9)]=9.4×[3.6÷6],=...
计算下面各题,能简算的要简算!有几道题必须简算,急!10分钟之内回答的加...
12.25+36+7.75=(12.25+7.75)+36=20+36=56 4.8\/0.24\/2=4.8\/(0.24*2)=4.8\/0.48=10 2.3+9*(22-19.7)=2.3+9*2.3=2.3*(9+1)=2.3*10=23 624-298(必须简算)=624-(300-2)=624-300+2=324+2=326 10.1*87(必须简算)=(10+0.1)*87=10*87+0.1*87...
计算下面各题,能简算的要简算。 (1)3.8X4.2+38X0.58 (2)36[(5\/6-2...
(1)3.8X4.2+38X0.58 =38X0.42+38X0.58 =38X(0.42+0.58)=38X1 =38 (2)36×[(5\/6-2\/3)X3]=36×[1\/6X3]=36×1\/2 =18 (3)1.25X32X2.5 =(1.25X8)X(4X2.5)=10X10 =100 (4)72000÷125÷8 =72000÷(125X8)=72000÷1000 =72 ...
计算下面各题,能简算的简算。
10÷8﹢3.96×12.5%﹢2.04×十六分之二 =10*1\/8+3.96*1\/8+2.04*1\/8 =1\/8*(10+3.96+2.04)=1\/8*16 =2 1又6\/7*3.6+3又3\/5*7又1\/7+3.6 =3.6*(1又6\/7+7又1\/7+1)=3.6*10 =36 85-84又7\/8÷7 =85-84又7\/8*1\/7 =85-(84*1\/7+7\/8*1\/7)...
计算下面各题,能简算的要简算.﹣+
答案:;;4;;;2 解析:试题分析:﹣(﹣ )可根据一个数减两个数的差,等于用这个数减去两个数中的被减数加上减数的减法性质计算;5﹣ ﹣ 可根据一个数减两个数等于用这个数减去这两个数的和的减法性质计算;﹣(+ )可根据一个数减两个数的和等于用这个数分别减去这两个数的减法性质...
下面各题,能简算的要用简便方法计算
3.7×4.5-4.4×3.7,=3.7×0.1,=0.37;(6)0.034×0.5×0.6,=0.034×0.3,=0.0102.点评:本题考点: 整数、分数、小数、百分数四则混合运算.考点点评: 此题考查整数、小数、分数、百分数的四则混合运算,能简算的,就用简便算法计算,不能简算的,要按照运算顺序进行计算.
计算下面各题,能简算的要简算,得数化成最简分数
解:3分之2+5分之4---10分之3=30分之20+30分之24-30分之9=6分之7=1又6分之1 8分之11--(6分之5+8分之3)=24分之33-(24分之20+24分之9)=6分之1 7分之6--(14分之11--2分之1)=14分之12-(14分之11-14分之7)=7分之4 9分之5+11分之4+11分之6+9分之4=(9...
计算下面各题,能简算的要简算
8\/5÷6×5\/12=8\/5×5\/12×1\/6=2\/3×1\/6=1\/9 8÷16\/3-3\/4=8×3\/16-3\/4=3\/2-3\/4=3\/4 3\/8×2\/3×4\/9=1\/9 5\/6÷(4\/7÷9\/14)=5\/6÷8\/9=15\/16 3\/7-3\/7×5\/12=3\/7×(1-5\/12)=3\/7×7\/12=1\/4 5\/12÷1\/4÷6×5\/6=5\/3÷6×5\/6=5\/18×...
计算下面各题,能简算的要简算(注意:要将重要的过程写下来,若回答正确详 ...
5分之4×9分之2+5分之3÷2分之9 =5分之4×9分之2+5分之3×9分之2 =9分之2×(5分之4+5分之3)=9分之2×5分之8 =45分之16 1-9分之8÷6分之5×16分之3 =1-9分之8×5分之6×16分之3 =1-(9分之8×16分之3)×5分之6 =1-6分之1×5分之6 =1-5...
计算下面各题(能简算的要简算)
解:(1)3分之1×5分之3+1 =1×3\/3×5+1 =1\/5+1 =1又1\/5 (1又5分之1)(2)7分之5-9分之5×7分之5 =5\/7×1-5\/9×5\/7 =5\/7×(1-5\/9)=5\/7×4\/9 =20\/63 (63分之20)(3)1-7分之5×25分之21 =1-5x21\/7x25 =1-1x3\/1x5 =1-3\/5 =2\/5 ...
象受力尔:[答案] ①1.25*7.8*0.8 =1.25*0.8*7.8 =1*7.8 =7.8 ②2.78*99+1.78 =2.78*(100-1)+1.78 =2.78*100-2.78*1+1.78 =278-2.78+1.78 =275.22+1.78 =277 ③101*5.78-5.78 =(101-1)*5.78 =100*5.78 =578
富川瑶族自治县19835916659: 以计算下面各题,能用简便算法的就用简便算法.(1)1124*16;(2)14*27;(3)712*6+512*6;(4)35*56;(5)513*47*14;(6)49*5*18. - ?
象受力尔:[答案] (1) 11 24*16 = 22 3 =7 1 3; (2) 1 4* 2 7= 1 14; (3) 7 12*6+ 5 12*6 =( 7 12+ 5 12)*6 =1*6 =6; (4) 3 5* 5 6= 1 2; (5) 5 13* 4 7*14 = 40 13 =3 1 13; (6) 4 9*5*18 = 4 9*18*5 =40.
富川瑶族自治县19835916659: 下面各题,能简算的要用简便方法计算.1.08*0.8÷0.27; 10.01*101 - 10.01; ... - ?
象受力尔:[答案] (1)1.08*0.8÷0.27=(1.08÷0.27)*0.8=4*0.8=3.2(2)10.01*101-10.01=10.01*(101-1)=10.01*100=1001(3)0.8*(12.5+0.125)=0.8*12.5+0.8*0.125=10+0.1=10.1(4)2.46÷0.82+33.6=3+33.6=36.6...
富川瑶族自治县19835916659: 计算下面各题,能简便计算的要用简便方法计算.60÷15+15*60 206*(39÷13*4)125*54 - 46*125 (730 - 80÷2)÷23400*[(270+80)÷7] 99+99*99. - ?
象受力尔:[答案] (1)60÷15+15*60, =4+900, =904; (2)206*(39÷13*4), =206*(3*4), =206*12, =2472; (3)125*54-46*125, =125*(54-46), =125*8, =1000; (4)(730-80÷2)÷23, =(730-40)÷23, =690÷23, =30; (5)400*[(270+80)÷7], =400*[350÷7], =400*50, =20000; (6)99+99*99,...
富川瑶族自治县19835916659: 计算下面各题,能简算的用简便方法计算!答案要化成最简便的分数)(1)12分之7---3分之1+6分之5(2)8分之5+12分之7+8分之3(3)6分之5+7分之2---2分之... - ?
象受力尔:[答案] 1. 7/12-1/3+5/6 =7/12-4/12+10/12 =13/12 2. 5/8+7/12+3/8 =5/8+3/8+7/12 =1+7/12 =1又7/12 3. 5/6+2/7-1/2 =5/6-3/6+2/7 =1/3+2/7 =7/21+6/21 =13/21 4. 1-3/7-4/7 =1-(3/7+4/7) =1-1 =0 5. 3/7+1/6+4/7+5/6 =(3/7+4/7)+(1/6+5/6) =1+1 =2 6. 5/6-(1/4+1/6) =5...
富川瑶族自治县19835916659: 计算下面各题,能简算的要用简便方法计算. - ?
象受力尔: 80-12*4÷3 = 80 - 4*(12÷3)= 80 - 4*4 = 80 - 16 = 64 60+180÷20-5 = 60 + 9 - 5 = 64 4.5-(2.68+0.86)=4.5 -(2.7-0.02+0.8+0.06)=4.5 -(3.5+0.04)= 4.5 - 3.5 - 0.04 =0.96 15.37-2.8-2.2 = 15.37 - (2.8+2.2)=15.37 - 5 = 10.37 19.92+10.35-9.92 =10.35 + (19.92 - 9.92)=10.35 + 10 = 20.3542*4*25 = 42*(4*25)= 42 *100 = 4200
富川瑶族自治县19835916659: 计算下面各题.(能简算的用简便算法)①12.36 - 6.49 - 3.51②8.5*3.8+8.5*6.2③0.2÷2.5*(4.2 - 1.075)④[3.2 - 3.2*(30.4 - 29.85)]÷1.8. - ?
象受力尔:[答案] ①12.36-6.49-3.51, =12.36-(6.49+3.51), =12.36-10, =11.36; ②8.5*3.8+8.5*6.2, =8.5*(3.8+6.2), =8.5*10, =85; ③0.2÷2.5*(4.2-1.075), =0.2÷2.5*3.125, =0.08*(3+0.125), =0.08*3+0.08*0.125, =0.24+0.01, =0.25; ④[3.2-3.2*(30.4-29.85)]÷1.8, =[3.2-3.2*0....
富川瑶族自治县19835916659: 计算下面各题,能简算的要用简便方法算.①627+9105÷15②5.78*99+5.78③413*(38+0.25*23)④78.5÷0.25÷4⑤5056 - 45.75 - 4.25⑥7.86+0.625*1.8÷4.5. - ?
象受力尔:[答案] ①627+9105÷15, =627+607, =1234; ②5.78*99+5.78 =5.78*(99+1), =5.78*100, =578; (3) 4 13*( 3 8+0.25* 2 3), = 4 13*( 3 8+ 1 6), = 4 13* 13 24, = 1 6; ④78.5÷0.25÷4, =7.85÷(0.25*4), =7.85÷1, =7.85; ⑤50 5 6-45.75-4.25 =50 5 6-(45.75+4.25), =50 5 ...
富川瑶族自治县19835916659: 计算下面各题,能简便计算的要用简便方法计算.1.0+2.21÷0.26=2.6*3.9+6.1*2.6=4.34÷0.7+1.8=0.8*1.9*12.5*5=13.191 - 3.87 - 6.13=5.8*98= - ?
象受力尔:[答案] ①1.0+2.21÷0.26=1.0+8.5=9.5②2.6*3.9+6.1*2.6=2.6*(3.9+6.1)=2.6*10=26③4.34÷0.7+1.8=6.2+1.8=8④0.8*1.9*12.5*5=(0.8*12.5)*1.9*5=10*1.9*5=95⑤13.191-3.87-6.13=13.191-(3.87+6.13)=13.19...
富川瑶族自治县19835916659: 计算下面各题,能简便计算的要用简便方法计算.190*[(350+70)÷6]99*99+99. - ?
象受力尔:[答案] (1)190*[(350+70)÷6] =190*[420÷6] =190*70 =13300 (2)99*99+99 =99*(99+1) =99*100 =9900