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解方程
x
8
=
0.24
0.6

1.24×4-7x=
3
5

x-30%x=50%x+12.
人气:220 ℃ 时间:2020-01-26 05:27:44
解答
(1)
x
8
0.24
0.6

        0.6x=8×0.24,
   0.6x÷0.6=1.92÷0.6,
           x=3.2;
(2)1.24×4-7x=
3
5

        4.96-7x=
3
5

     4.96-7x+7x=
3
5
+
7x,
         
3
5
+7x=4.96,
      
3
5
+7x-
3
5
=4.96-
3
5

          7x÷7=4.36÷7,
              x=
109
175

(3)x-30%x=50%x+12,
x-30%x-50%x=50%x+12-50%,
       0.2x=12,
  0.2x÷0.2=12÷0.2,
          x=60.
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