问题 解答题
解方程.
5
7
=
5
14
4X÷
2
9
=45
1
2
X+
1
6
=
3
8
50%X=4.
答案

(1)X×

5
7
=
5
14

5
7
÷
5
7
=
5
14
÷
5
7

X=

5
14
×
7
5

X=

1
2

(2)4X÷

2
9
=45,

4X÷

2
9
×
2
9
=45×
2
9

4X=10,

4X÷4=10÷4,

X=2.5;

(3)

1
2
X+
1
6
=
3
8

1
2
X+
1
6
-
1
6
=
3
8
-
1
6

1
2
X=
5
24

1
2
X×2=
5
24
×2,

X=

5
12

(4)50%X=4,

0.5x=4,

0.5x÷0.5=4÷0.5,

x=8.

单项选择题
单项选择题