问题 解答题

解方程.

(1)7x÷3=8.19         

(2)4x-0.5x=0.7        

(3)3.5×6-3x=11.4.

答案

(1)7x÷3=8.19,

          

7
3
x=8.19,

     

7
3
3
7
=8.19×
3
7

             x=3.51;

(2)4x-0.5x=0.7,

        3.5x=0.7,

   3.5x÷3.5=0.7÷3.5,

           x=0.2;

(3)3.5×6-3x=11.4,

      21-3x+3x=11.4+3x,

       11.4+3x=21,

  11.4+3x-11.4=21-11.4,

         3x÷3=9.6÷3,

             x=3.2.

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