X²+Y²-4x-6y+12=0 2X²+2Y²-4x+8y+5=0这两个咋算
X²+Y²-4x-6y+12=0 2X²+2Y²-4x+8y+5=0这两个咋算
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
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=
x²+4y²-2x+12y+10=0求X,Y值
已知x²+y²-2x+4y+5=0,求x+y
已知x²+4x+y-2y+5=0求x+2y
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(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x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²