来自商桂梅的问题
x+25%x=12.517%x—100=240x+20%=3.690%x—60%x=48
x+25%x=12.517%x—100=240x+20%=3.690%x—60%x=48
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2020-05-31 21:45
x+25%x=12.517%x—100=240x+20%=3.690%x—60%x=48
x+25%x=12.517%x—100=240x+20%=3.690%x—60%x=48
x+25%x=12.5
(1+25%)x=12.5
125%x=12.5
x=12.5÷125%
x=10
17%x—100=240
17%x=240+100
17%x=340
x=340÷17%
x=2000
x+20%=3.6
x=3.6-20%
x=3.6-0.2
x=3.4
90%x—60%x=48
(90%-60%)x=48
30%x=48
x=48÷30%
x=160