[(x+2y)-(x+y)(3y-y)-5y]除以2x 得多少?""代表平方[(x+2y)-(x+y)(3x-y)-5y*]除以2x

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[(x+2y)*-(x+y)(3y-y)-5y*]除以2x 得多少?"*"代表平方[(x+2y)*-(x+y)(3x-y)-5y*]除以2x
[(x+2y)*-(x+y)(3y-y)-5y*]除以2x 得多少?
"*"代表平方
[(x+2y)*-(x+y)(3x-y)-5y*]除以2x

[(x+2y)*-(x+y)(3y-y)-5y*]除以2x 得多少?"*"代表平方[(x+2y)*-(x+y)(3x-y)-5y*]除以2x
...我想您是抄错题了呢.
(x+y)(3y-y)这个.你再对对.
我就知道!.
[(x+2y)*-(x+y)(3x-y)-5y*]÷2x
=[x*+4y*+4xy-(3x*+2xy-2y*)-5y*]÷2x
=[x*+4y*+4xy-3x*-2xy+2y*-5y*]÷2x
=[-2x*+2xy]÷2x
=-x+y
好了、就是这样的.

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