问题 解答题
解方程.
X-
1
4
X=
3
8
4
5
=
15
28
2
3
1
4
=12.
答案

(1)X-

1
4
X=
3
8

(1-

1
4
)X=
3
8

3
4
X=
3
8

3
4
4
3
=
3
8
×
4
3

X=

1
2

(2)X÷

4
5
=
15
28

4
5
×
4
5
=
15
28
×
4
5

X=

3
7

(3)

2
3
1
4
=12,

2
3
1
4
×
1
4
=12×
1
4

2
3
X=3,

2
3
3
2
=3×
3
2

X=

9
2

解答题
单项选择题 B型题