问题 解答题

解方程.

(1)x÷0.26=0.52                           

(2)9x-2x=21.7

(3)3.18×2-2x=4.26                      

(4)0.25x+3.75=12.

答案

解方程:(1)x÷0.26=0.52                           

       x÷0.26×0.26=0.52×0.26,

                   x=0.1352;

(2)9x-2x=21.7,

        7x=21.7,

     7x÷7=21.7÷7,

         x=3.1;

(3)3.18×2-2x=4.26,

        6.36-2x=4.26,

             2x=6.36-4.26,

          2x÷2=2.1÷2,

              x=1.05;  

(4)0.25x+3.75=12.

0.25x+3.75-3.75=12-3.75,

    0.25x÷0.25=8.25÷0.25,

              x=33.

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