问题 解答题

(1)3x-5.2-2.2x=6.8

(2)9.5(x-3)=76

(3)60x-7.5=35x

(4)x÷3-27=18.

答案

(1)3x-5.2-2.2x=6.8

     0.8x-5.2+5.2=6.8+5.2

             0.8x=12

        0.8x÷0.8=12÷0.8

                x=15;

(2)9.5(x-3)=76

9.5(x-3)÷9.5=76÷9.5

          x-3=8

        x-3+3=8+3

            x=11;

(3)60x-7.5=35x

 60x-7.5-35x=35x-35x

 25x-7.5+7.5=0+7.5

         25x=7.5

     25x÷25=7.5÷25

           x=0.3;

(4)x÷3-27=18

 x÷3-27+27=18+27

       x÷3=45

    x÷3×3=45×3

          x=135.

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