关于整式运算已知A=2x*2-3xy+1-2y*2

关于整式运算已知A=2x*2-3xy+1-2y*2,B=x*2+1-3xy+3y*2,若2x*2 y•A-3

2个回答

C=3xy²B-2x²yA
=3x³y²+3xy²-9x²y³+9xy^4-4x^4y+6x³y²-2x²y+4x²y³
=9x³y²+3xy²-5x²y³+9xy^4-4x^4y-2x²y