试题:
解方程,我没问题!
2
3
X=
2
5
8(x-2)=2(x+7)
3
20
:18%=
6.5
x
解方程 2016-05-21

答案:

我来补答
(1)
2
3
x=
2
5

2
3
2
3
x=
2
5
×
2
3
x

4
15
x=4

4
15
15
4
=4×
15
4

x=15;

(2)8(x-2)=2(x+7),
8x-16=2x+14,
8x-16-2x=2x+14-2x,
6x-16=14,
6x-16+16=14+16,
6x÷6=30÷6,
x=5;

(3)
3
20
:18%=
6.5
x

3
20
x=18%×6.5

3
20
20
3
=1.17×
20
3

x=7.8.
 
 
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