化简(x2+3y)(x-2y)-(y+2x)(2x-y)

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化简(x2+3y)(x-2y)-(y+2x)(2x-y)化简(x2+3y)(x-2y)-(y+2x)(2x-y)化简(x2+3y)(x-2y)-(y+2x)(2x-y)(x²+3y)(x-2

化简(x2+3y)(x-2y)-(y+2x)(2x-y)
化简(x2+3y)(x-2y)-(y+2x)(2x-y)

化简(x2+3y)(x-2y)-(y+2x)(2x-y)
(x²+3y)(x-2y)-(y+2x)(2x-y)
=x³-2x²y+3xy-6y²-4x²+y²
=x³-4x²-2x²y+3xy-5y²