问题 解答题
5
8
:x=3:16
42
x
=0.7:5
12.5%:0.25=150:x
x
5
25
40
答案

(1)

5
8
:x=3:16,

           3x=16×

5
8

        3x÷3=10÷3,

            x=3

1
3

(2)

42
x
=0.7:5,

     0.7x=42×5,

0.7x÷0.7=210÷0.7,

        x=300;

(3)12.5%:0.25=150:x,

          12.5%x=0.25×150,

  12.5%x÷12.5%=37.5÷12.5%,

              x=300;

(4)

x
5
=
25
40

    40x=5×25,

40x÷40=125÷40,

     x=3.125.

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