解方程.68x+60x=256 8×(x+3.5)=100 3.2x-54=10 4x+7.6×...

解方程.68x+60x=256 8×(x+3.5)=100 3.2x-54=10 4x+7.6×3=52.8.
2025-04-18 10:06:53
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回答1:

(1)68x+60x=256
            128x=256
       128x÷128=256÷128
               x=2;

(2)8×(x+3.5)=100
  8×(x+3.5)÷8=100÷8
           x+3.5=12.5
       x+3.5-3.5=12.5-3.5
               x=9;

(3)3.2x-54=10
  3.2x-54+54=10+54
        3.2x=64
   3.2x÷3.2=64÷3.2
           x=20;

(4)4x+7.6×3=52.8
      4x+22.8=52.8
 4x+22.8-22.8=52.8-22.8
           4x=30
        4x÷4=30÷4
            x=7.5.