化简(x2+3y)(x-2y)-(y+2x)(2x-y)

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/05 15:20:55

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