试题:
求未知数x.
3
4
x+
1
2
x
=
15
16

7X÷
1
2
=
7
10

X
5
=
3
5
1
2
解方程 2016-05-21

答案:

我来补答
(1)
3
4
x+
1
2
x
=
15
16

5
4
X=
15
16

5
4
4
5
=
15
16
×
4
5

X=
3
4


(2)7X÷
1
2
=
7
10

7X÷
1
2
×
1
2
=
7
10
×
1
2

7X÷7=
7
20
÷7

X=
1
20


(3)
X
5
=
3
5
1
2

1
2
X=
3
5
×
5,
1
2
X×2=3×2,
X=6.
 
 
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