问题 解答题
解方程.
(1)χ-
3
5
χ=
6
5

(2)42:
3
5
=χ:
5
7

(3)5x-0.4=75%
答案

(1)χ-

3
5
χ=
6
5

2
5
x=
6
5

2
5
x÷
2
5
=
6
5
÷
2
5

x=3;

(2)42:

3
5
=χ:
5
7

3
5
x=42×
5
7

3
5
x÷
3
5
=30÷
3
5

x=50;

(3)5x-0.4=75%,

5x-0.4+0.4=75%+0.4,

5x÷5=1.15÷5,

x=0.23.

判断题
填空题