6x²+11xy+3y²+4x-y-2
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
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
x²-xy-6y²-2x+11y-3;2x²-xy-6y²+3x+8y-2; 3
x²-xy-6y²-2x+11y-3; 2x²-xy-6y²+3x+8y-2;
若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y.
1.设A=2x²-3xy+y²+x-3y,B=4x²-6xy+2y²+4x-y,
设A=2x²-3xy+y²+x-3y ,B=4x²-6xy+2y²+4x-y ,
设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y 若|
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若│