(3xy²-6x²y)/(-x)=
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值
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
x²/xy-x/y
计算:(xy-x²)×x-y/xy
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
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│
1.设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,