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解方程.x+28=72x-460=53020x=140x÷0.8=1.25x-0.52=1.3x×0.6=4.2.

题目详情
解方程.
x+28=72                 x-460=530                   20x=140
x÷0.8=1.25 x-0.52=1.3 x×0.6=4.2.

x+28=72                 x-460=530                   20x=140
x÷0.8=1.25 x-0.52=1.3 x×0.6=4.2.
x+28=72                 x-460=530                   20x=140x+28=72                x-460=530                  20x=140 x÷0.8=1.25 x-0.52=1.3 x×0.6=4.2.x÷0.8=1.25x-0.52=1.3x×0.6=4.2.
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答案和解析
(1)x+28=72
     x+28-28=72-28
           x=44

  (2)x-460=530
  x-460+460=530+460
          x=990

 (3)20x=140
  20x÷20=140÷20
        x=7

 (4)x÷0.8=1.25
 x÷0.8×0.8=1.25×0.8
           x=1

 (5)x-0.52=1.3
x-0.52+0.52=1.3+0.52
          x=1.82

 (6)x×0.6=4.2
 x×0.6÷0.6=4.2÷0.6
           x=7