试题:
求未知数x.
12-5x=6.5     
22.5
4
=
x
5

9
16
:x=
3
16

答案:

我来补答
(1)12-5x=6.5,
5x=12-6.5,
5x=5.5
x=1.1;
    
(2)
22.5
4
=
x
5

4x=22.5×5,
4x=112.5,
x=28.125;

(3)
9
16
:x=
3
16

3x=
9
16
×16,
3x=9,
x=3.
 
 
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