问题 解答题
巧解密码我能行.
5x-5×
1
3
=0.8         
12:5=x:0.3            
0.45
x
=
9
16
答案

(1)5x-5×

1
3
=0.8,

           5x-

5
3
=0.8,

        5x-

5
3
+
5
3
=0.8+
5
3

             5x=

37
15

          5x÷5=

37
15
÷5,

              x=

37
75

(2)12:5=x:0.3,

       5x=12×0.3,

    5x÷5=3.6÷5,

        x=0.72;

(3)

0.45
x
=
9
16

        9x=0.45×16,

     9x÷9=7.2÷9,

         x=0.8.

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