问题 解答题
解方程:
3
4
=40;
y-60%y=20;
3
8
+
3
8
m=
5
8
答案

(1)x÷

3
4
=40,

3
4
×
3
4
=40×
3
4

x=30;

(2)y-60%y=20,

(1-60%)y=20,

40%y=20,

0.4y÷0.4=20÷0.4,

y=50;

(3)

3
8
+
3
8
m=
5
8

3
8
+
3
8
m-
3
8
=
5
8
-
3
8

3
8
m=
1
4

3
8
8
3
=
1
4
×
8
3

m=

2
3

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