x²-y²=48,x+y=6,则x= y=
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
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
{(x+2y)(x-2y)+[2(x-y)]²}÷6x=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
若实数X,Y满足X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.