问题 解答题
解方程
(1)
1
2
x=(95-x)×
1
3

(2)
7.5
x
=2.5:0.9.
答案

(1)

1
2
x=(95-x)×
1
3

1
2
x=95×
1
3
-
1
3
x,

1
2
x+
1
3
x=
95
3

5
6
x=
95
3

5
6
x÷
5
6
=
95
3
÷
5
6

x=38;

(2)

7.5
x
=2.5:0.9,

2.5x=7.5×0.9,

2.5x=6.75,

2.5x÷2.5=6.75÷2.5,

x=2.7.

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