问题 解答题
解方程.
8X+25=57
2
5
X+
1
4
X=26
7X÷
1
2
=
3
5
答案

(1)8X+25=57,

8X+25-25=57-25,

8X=32,

8X÷8=32÷8,

X=4;

(2)

2
5
X+
1
4
X=26,

13
20
X=26,

13
20
13
20
=26÷
13
20

X=40;

(3)7X÷

1
2
=
3
5

7X÷

1
2
×
1
2
=
3
5
×
1
2

7X=

3
10

7X÷7=

3
10
÷7,

X=

3
70

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