问题 解答题
求未知数x的值:
x+
1
2
x=
4
5

9(x-1)=3(x+8)
0.372:0744=
1
10
:x.
答案

(1)x+

1
2
x=
4
5

(1+

1
2
)x=
4
5

3
2
x=
4
5

3
2
2
3
=
4
5
×
2
3

x=

8
15

(2)9(x-1)=3(x+8),

9x-9=3x+24,

9x-9+9=3x+24+9,

9x=3x+33,

9x-3x=3x+33-3x,

6x=33,

6x÷6=33÷6,

x=

11
2

(3)0.372:0.744=

1
10
:x,

0.372x=0.744×0.1,

0.372x÷0.372=0.0744÷0.372,

x=0.2.

选择题
单项选择题