作业帮1.(-x-y)(x-y)=( )(x+y)(y-x) 2.(2+x)(x-2)=(x+2)(x-2)两道题,
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1.(-x-y)(x-y)=( )(x+y)(y-x) 2.(2+x)(x-2)=(x+2)(x-2)两道题,
1.(-x-y)(x-y)=( )(x+y)(y-x) 2.(2+x)(x-2)=(x+2)(x-2)两道题,
1.(-x-y)(x-y)=( )(x+y)(y-x) 2.(2+x)(x-2)=(x+2)(x-2)两道题,
1.(-x-y)(x-y)=( +)(x+y)(y-x) 2. (2+x)(x-2)=+(x+2)(x-2)对
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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y=x(x
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x>y?x:y
x+y=1.
x+x+x+x+y+y+y=56
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x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
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