一道英语题 三道数学题 急 在线等

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三道英文数学题~

1.a,b,c,d,e中的每一个要么总是说假话要么总是说真话,他们知道他们各是什么样的人
a说b是说谎者
b说c是说谎者
c说d是说谎者
d说e是说谎者
他们间最多可能有几个说谎者? 3个

分析:T;说真话;L:说假话
只有如下两种情况
a:T,b:L,c:T,d:L,e:T
a:L,b:T,c:L,d:T,e:L
所以最多有3个说谎者


2.在她2007年的生日,MARY的年龄等于她出生年份的各个数字之和的两倍,她出生的年份共有几个? 4个

分析:她的年龄最多56岁(2*(1+9+9+9)),所以从1950试到2007,为了方便,遍了一段代码,语言是Visual Basic(2005)

Public Class Null '不限定包含于的窗体,所以定窗体名称为空(Null)
Dim private_year As Integer = 1950
Dim calculated_year As ListBox

Private Sub calculate()
Do
If 2007 - private_year = 2 * Val((private_year.ToString.Substring(0, 1)) + Val(private_year.ToString.Substring(1, 1)) + Val(private_year.ToString.Substring(2, 1)) + Val(private_year.ToString.Substring(3, 1))) Then '从If到Then是一行
calculated_year.Items.Add(private_year)
End If
private_year = private_year + 1
Loop Until private_year >= 2007
End Sub
End Class

得到的结果是1959,1965,1971,2001四个年份


3.一个两位数等于它各个数字之和的三倍,这样的数有几个? 1个

分析:设十位数为x,个位数为y (x,y∈Z 1≤x≤9 0≤y≤9)
列出方程
10x + y = 3 * (x + y)
7x = 2y
这个方程只有 x = 2, y = 7 这一个解
所以这样的数只有一个,27

I want to do a math problem

what was happening
3. DF =8
2. 若三角形ABC D是BC中点.E 是AD上的点.则BDE的面积=CDE的面积(BD=CD,且高相等)
...下面那位兄弟抄袭啊.....
赵国·公子....你很不对啊!!!!

She didn't know what was happening outside.


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