(x+y)²+6(x+y)+9 a²-2a(b+c)+(b+c)² 4xy-4x²
A=4x²-4xy+y² B=x²+xy-5y² 又2A+B+C=0 求C
因式分解2x²y-xy-3y (-a+b)+c²(a-b)
已知A=2x²+3xy-y²,B=-1/2xy,C=1/8x³y³-1/4x
通分(1)6c/a²b与c/3ab² (2)x - y/2x+3y与xy/(x+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
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│