问题 解答题

解方程.

(1)(1-25%)x=72                     

(2)x-40%x=5.04

(3)x÷(1-40%)=3.6                     

(4)34x-25%x=12.

答案

(1)(1-25%)x=72,

               75%x=72,

          75%x÷75%=72÷75%,

                  x=96;

(2)x-40%x=5.04,

       60%x=5.04,

  60%x÷60%=5.04÷60%,

          x=8.4;

(3)x÷(1-40%)=3.6,

           x÷60%=3.6,

      x÷60%×60%=3.6×60%,

                x=2.16;

(4)34x-25%x=12,

       33.75x=12,

33.75x÷33.75=12÷33.75,

            x=

16
45

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