问题 解答题
解方程.
9
10
X-2=
3
5
2
5
=
3
8
2
5
+
3
5
X=
18
25
3
4
X-
1
3
X=10.
答案

(1)

9
10
X-2=
3
5

9
10
X-2+2=
3
5
+2,

9
10
X=2
3
5

9
10
9
10
=2
3
5
÷
9
10

X=

26
9

(2)X÷

2
5
=
3
8

2
5
×
2
5
=
3
8
×
2
5

X=

3
20

(3)

2
5
+
3
5
X=
18
25

2
5
+
3
5
X-
2
5
=
18
25
-
2
5

3
5
X=
8
25

3
5
X÷
3
5
=
8
25
÷
3
5

X=

8
15

(4)

3
4
X-
1
3
X=10;

5
12
X=10,

5
12
X÷
5
12
=10÷
5
12

X=24.

单项选择题
问答题