问题 解答题
解方程
6×1.5+5X=1210-0.35X=7
1
5
5X-
1
4
×6=7.5.
答案

(1)6×1.5+5x=12,

              9+5x=12,

            9+5x-9=12-9,

                5x=3,

             5x÷5=3÷5,

                 x=

3
5

(2)10-0.35x=7

1
5

10-0.35x+0.35x=7.2+0.35x,

     7.2+0.35x=10,

 7.2+0.35x-7.2=10-7.2,

         0.35x=2.8,

   0.35x÷0.35=2.8÷0.35,

             x=8;

(3)5x-

1
4
×6=7.5,

       5x-1.5=7.5,

   5x-1.5+1.5=7.5+1.5,

           5x=9,

        5x÷5=9÷5,

            x=1.8.

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