问题 解答题

解方程.

6x-7.8=10.92

5×2.5+5x=36.

答案

(1)6x-7.8=10.92,

     6x-7.8+7.8=10.92+7.8,

             6x=18.72,

          6x÷6=18.72÷6,

              x=3.12;

(2)5×2.5+5x=36,

       12.5+5x=36,

  12.5+5x-12.5=36-12.5,

            5x=23.5,

         5x÷5=23.5÷5,

             x=4.7.

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