解: 2.5x ÷7.5=0.25
2.5x =7.5×0.25
x =7.5×0.25/2.5
x=0.75
验算:2.5×0.75÷7.5
=2.5×0.75/7.5
=0.75/3
=0.25
2.5x÷7.5=0.25
2.5x=0.25*7.5(可省略这一步)
2.5x=1.875
x=1.875÷2.5(可省略这一步)
x=0.75
2.5x/7.5=0.25x/0.75=1/3x
方程两边同乘7.5.
2.5ⅹ=0.25*7.5
方程两边同除以2.5.
x=0.25*3
x=0.75
正常不用检验。
检验把x=0.75代入原方程
2.5*0.75/7.5=0.25
2.5x÷7.5=0.25
解:2.5x=0.25×7.5
2.5x=1.875
x=0.75