2x+6y-x²+9y²=?
(x-y)³+9(x-y)-6(x-y)²
{(x+2y)(x-2y)+[2(x-y)]²}÷6x=?
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
已知4x²+y²-4x-6y+10=0,求[(2/3)x√(9x)+y²√(x/y
已知4x²+y²-4x-6y+10=0,求(2/3√9x+y²√x/y³)-(x
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
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+
(X-Y)²+(3X-2Y)(2X+Y)-X(6X-Y),其中X=½,Y=1(先化简再求值)
函数f(x,y)=x²+y²-2x+4y+9的最小值
已知:x²y²-2x+6y+10=0则x+y=