问题 解答题
求未知数x
x-
5
8
x-6=18
20:x=
5
2
:15.
答案

(1)x-

5
8
x-6=18,

          

3
8
x-6=18,

       

3
8
x-6+6=18+6,

           

3
8
x=24,

        

3
8
8
3
=24×
8
3

              x=64;

(2)20:x=

5
2
:15,

      

5
2
x=20×15,

      

5
2
x=300,

   

5
2
2
5
=300×
2
5

         x=120.

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