[(x+2y)(x-2y)+4(x-y)²]/6x
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知x²+y²-6x+4y+13=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
x²-4y² x+2y
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值
(3x-2y)²(3x-2y)²(9x²+4y²)²
(x+y)²-2(x²-y²)+(y-x)²
已知4x²+y²-4x-6y+10=0,求(2x/3*√(9x)+y²√(x/y³
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|