问题 解答题

解方程.

2x+8=11.26

x-1.2=9.3

5x+8=22

1.2x+0.56=2

6x-2x=18

1.5x+1.7x=6.4.

答案

(1)2x+8=11.26,

   2x+8-8=11.26-8,

       2x=3.26,

    2x÷2=3.26÷2,

        x=1.63;

(2)x-1.2=9.3,

 x-1.2+1.2=9.3+1.2,

         x=10.5;

(3)5x+8=22,

   5x+8-8=22-8,

       5x=14,

    5x÷5=14÷5,

        x=2.8;

(4)1.2x+0.56=2,

1.2x+0.56-0.56=2-0.56,

          1.2x=1.44,

     1.2x÷1.2=1.44÷1.2,

             x=1.2;

(5)6x-2x=18,

        4x=18,

     4x÷4=18÷4,

         x=4.5;

(6)1.5x+1.7x=6.4,

          3.2x=6.4,

     3.2x÷3.2=6.4÷3.2,

             x=2.

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