|2/3x-6|+(0.2+2y) ²=0则x²+y²=
已知:x²y²-2x+6y+10=0则x+y=
x²-2x+y²+6y+10=0,则x+y=?
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
若实数X,Y满足X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
已知x²+4x+y²-2y+5=0,则x+y=
已知x+3y=0,求x³+3x²y-2x-6y的值.
(X-Y)²+(3X-2Y)(2X+Y)-X(6X-Y),其中X=½,Y=1(先化简再求值)