计算:(x-y)(x+2y)+(2x-y)(2x+y)
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计算:(x-y)(x+2y)+(2x-y)(2x+y)
原式=x²+xy-2y²+4x²-y²=5x²+xy-3y²
多项式乘以多项式,完了合并同类项
是化简吗?what?
原式=x^2+xy-2y^2+4x^2-y^2=5x^2+xy-3y^2
5x2+xy+y2
如果你是初中的话,那我就用简单点的方法教你吧!
(x-y)(x+2y)+(2x-y)(2x+y)=(x-y)x+(x-y)2y+(2x-y)2x+(2x-y)y=x²-xy+2xy-2y²+4x²-2xy+2xy-y²
=5x²+xy-3y²
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