化简下列各式：(7x²-4xy+8y²)-(2x²-3y²)(8ab-3a²)+5ab-2(3ab-2a²)9x+6x²-3(x-3分之2x的平方)3(5x²y-2xy²)-6(xy²+3x²y)答案我晓得,只是为验证自己做对没有

化简下列各式：(7x²-4xy+8y²)-(2x²-3y²)(8ab-3a²)+5ab-2(3ab-2a²)9x+6x²-3(x-3分之2x的平方)3(5x²y-2xy²)-6(xy²+3x²y)答案我晓得,只是为验证自己做对没有
化简下列各式：
(7x²-4xy+8y²)-(2x²-3y²)
(8ab-3a²)+5ab-2(3ab-2a²)
9x+6x²-3(x-3分之2x的平方)
3(5x²y-2xy²)-6(xy²+3x²y)
答案我晓得,只是为验证自己做对没有

化简下列各式：(7x²-4xy+8y²)-(2x²-3y²)(8ab-3a²)+5ab-2(3ab-2a²)9x+6x²-3(x-3分之2x的平方)3(5x²y-2xy²)-6(xy²+3x²y)答案我晓得,只是为验证自己做对没有
5x²-4xy+11y²
7ab+a²
8x²+3x
33x²y-12xy²