(1) 4x²-16 (2) xy-9x³y (3) 12abc-3bc² (4) a
(1) 4x²-16 (2) xy-9x³y (3) 12abc-3bc² (4) a
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a(x
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
已知A=2x²+3xy-y²,B=-1/2xy,C=1/8x³y³-1/4x
已知2x²+xy=a,3y²-2xy=b,求4x²+8xy-9y²的值(用含a,
已知2x²+xy=a,3y²+2xy=b,求4x²+8xy+9y²的值(用a,b