计算:(x+2y)(2x-y)
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计算:(x+2y)(2x-y)计算:(x+2y)(2x-y)计算:(x+2y)(2x-y):(x+2y)(2x-y)=2x^2-xy+4xy-2y^2=2x^2+3xy-2y^2(x+2y)(2x-y
计算:(x+2y)(2x-y)
计算:(x+2y)(2x-y)
计算:(x+2y)(2x-y)
:(x+2y)(2x-y)
=2x^2-xy+4xy-2y^2
=2x^2+3xy-2y^2
(x+2y)(2x-y)
=2x^2-xy+4xy-2y^2
=2x^2+3xy-2y^2..
2*x^2+3*x*y-2*y^2
2X^2+3XY-2Y^2
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