问题 解答题
解比例和方程.
75:x=25:1524%x+8%x=161.8:x=
3
4
1
4
0.25
x
=
0.5
2
答案

(1)75:x=25:15,

           25x=75×15,

       25x÷25=1125÷25,

             x=45;

(2)24%x+8%x=16,

         32%x=16,

    32%x÷32%=16÷32%,

            x=50;

(3)1.8:x=

3
4
1
4

       

3
4
x=1.8×
1
4

    

3
4
x÷
3
4
=
9
20
÷
3
4

          x=

3
5

(4)

0.25
x
=
0.5
2

      0.5x=0.25×2,

 0.5x÷0.5=0.5÷0.5,

         x=1.

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