-3(2x²-xy)+4(x²+xy-6)
16x²y-16x³-4xy 因式分解
计算18(4x²-xy)-19(4x²-xy)+(4x²-xy-1),
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
因式分解-16x²y²+12xy³z-4xy
因式分解:4x²y+4xy²+xy²
计算:(xy-x²)×x-y/xy
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
因式分解:x²-y²+4xy