已知x²+y²-6x+4y+13=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值
已知x²+y²-6x+4y+13=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知:x²+4x+y²-+6y+13=0,求x-2y/x²+y²的值.
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
|x+2y+3|+(2x+y)²=0求x²-xy+y²
已知4x²+y²-4x-6y+10=0,求(2x/3*√(9x)+y²√(x/y³
已知x²+4x+y²-10y+29=0 求【x+2y】÷【x²-2y²】的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy
已知:x²+y²+4x+6y+13=0 求:x²+y²的值
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²