作业帮已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙
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已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙
已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙
已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙
[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]/y=(x^2+4xy+4y^2+2x^2-4y^2-7xy-3x^2+3y^2)/y=(3y^2-3xy)/y=3(y-x)=-3
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