问题 解答题
解方程
(1)2x+8=38
(2)8x-9=39
(3)58-7x=9(4)0.6x+2.4=3.6
(5)128+13x=297(6)22.5-5x=9.5.
答案

(1)2x+8=38,

      2x+8-8=38-8,

       2x÷2=30÷2,

           x=15;

(2)8x-9=39,

   8x-9+9=39+9,

    8x÷8=48÷8,

        x=6;

(3)58-7x=9,

  58-7x+7x=9+7x,

      58-9=9+7x-9,

     49÷7=7x÷7,

         x=7;

(4)0.6x+2.4=3.6,

0.6x+2.4-2.4=3.6-2.4,

   0.6x÷0.6=1.2÷0.6,

           x=2;

(5)128+13x=297,

128+13x-128=297-128,

    13x÷13=169÷13,

          x=13;

(6)22.5-5x=9.5,

  22.5-5x+5x=9.5+5x,

    22.5-9.5=9.5+5x-9.5,

       13÷5=5x÷5,

           x=2.6.

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