问题 解答题
求未知数X的值:
(1)
3
5
X-27.5=2.5                        (2)
9
0.4x
=6:
3
8
答案

(1)

3
5
X-27.5=2.5,

   

3
5
X-27.5+27.5=2.5+27.5,

             

3
5
x=30,

          

3
5
x÷
3
5
=30÷
3
5

                x=50;

 

(2)

9
0.4x
=6:
3
8

    0.4x×6=9×

3
8

       2.4x=

27
8

  2.4x÷2.4=

27
8
÷2.4,

          x=1

13
32

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