问题 解答题

解方程

(1)X÷0.05=3.528

(2)11.5X+X=20

(3)5.5X-1.3X=12.6

(4)3×4+4X=28.

答案

(1)x÷0.05=3.528,

   x÷0.05×0.05=3.528×0.05,

               x=0.1764;

(2)11.5x+x=20,

       12.5x=20,

 12.5x÷12.5=20÷12.5,

           x=1.6;

(3)5.5x-1.3x=12.6,

          4.2x=12.6,

     4.2x÷4.2=12.6÷4.2,

             x=3;

(4)3×4+4x=28,

    12+4x-12=28-12,

       4x÷4=16÷4,

           x=4.

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