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解方程.15×(x+0.6)=185.9x-2.4x=75x+5.5=76×4-0.5x=12.8x÷6=3.6.

题目详情
解方程.
15×(x+0.6)=18 5.9x-2.4x=7 5x+5.5=7 6×4-0.5x=12.8 x÷6=3.6.
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答案和解析
(1)15×(x+0.6)=18,
     15×(x+0.6)÷15=18÷15,
                 x+0.6=1.2,
             x+0.6-0.6=1.2-0.6,
                    x=0.6;

(2)5.9x-2.4x=7,
          3.5x=7,
     3.5x÷3.5=7÷3.5,
             x=2;

(3)5x+5.5=7,
 5x+5.5-5.5=7-5.5,
         5x=1.5,
      5x÷5=1.5÷5,
          x=0.3;

(4)6×4-0.5x=12.8,
  24-0.5x+0.5x=12.8+0.5x,
     12.8+0.5x=24,
12.8+0.5x-12.8=24-12.8,
          0.5x=11.2,
     0.5x÷0.5=11.2÷0.5,
            x=22.4;

(5)x÷6=3.6,
  x÷6×6=3.6×6,
       x=21.6.