若x²-y²=12,x+y=6则x=+ ,y=
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
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
若4x²+9y²-12x+6y+10=0,则x+y=
已知x²-y²=12,x+y=6,求x,y的值
已知:x²y²-2x+6y+10=0则x+y=
x²-2x+y²+6y+10=0,则x+y=?
已知x-y=2则代数式6-x+y-(y-x)²的值是多少
若点(x,y)满足x²+y²-6x-4y+12=0.则x/y的最大值和最小值分别是?
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
{(x+2y)(x-2y)+[2(x-y)]²}÷6x=?