问题 解答题
解方程
3
4
x-
1
4
=
2
5
2
3
X-
3
8
X=
7
16
1
5
=25
X-
2
3
X=
2
9
答案

(1)

3
4
x-
1
4
=
2
5

3
4
x-
1
4
+
1
4
=
2
5
+
1
4

3
4
x=
13
20

3
4
3
4
=
13
20
÷
3
4

x=

13
15

(2)

2
3
X-
3
8
X=
7
16

7
24
X=
7
16

7
24
7
24
=
7
16
÷
7
24

X=

3
2

(3)X÷

1
5
=25,

1
5
×
1
5
=25×
1
5

X=5;

(4)X-

2
3
X=
2
9

1
3
X=
2
9

1
3
1
3
=
2
9
÷
1
3

X=

2
3

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