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

Question

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．

Answer 1

（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