90+1.5x=y 100+2x=y y=?
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90+1.5x=y100+2x=yy=?90+1.5x=y100+2x=yy=?90+1.5x=y100+2x=yy=?90+1.5x=y(1)100+2x=y(2)(2)-(1)得:100+2x-9
90+1.5x=y 100+2x=y y=?
90+1.5x=y 100+2x=y y=?
90+1.5x=y 100+2x=y y=?
90+1.5x=y (1)
100+2x=y (2)
(2)-(1)得:100+2x-90-1.5x=0
解得:0.5x+10=0
x= - 20
所以y=60
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
90+1.5x=y 100+2x=y y=?
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