(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)
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(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)
(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)
(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)
(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)
=x^2-y^2-2xy+3x^2-3xy-2x^2+5xy
=2x^2-y^2
﹙x²-y²-2xy﹚-3﹙﹣x²+xy﹚-2﹙x²-5/2 xy﹚
=x²-y²-2xy+3x²-3xy-2x²+5xy
=2x²-y²