已知A=8x2y-6xy2-3xy,B=7xy2-2xy+5x2y,若A+B-3C=0,求C-A.
人气:426 ℃ 时间:2019-08-21 18:52:34
解答
由题意得:3C=A+B=8x
2y-6xy
2-3xy+7xy
2-2xy+5x
2y=13x
2y+xy
2-5xy,
∴C=
,
故:C-A=
-(8x
2y-6xy
2-3xy),
=
-8x
2y+6xy
2+3xy,
=-
x
2y+
xy
2+
xy.
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