已知|x-y+1|与x2+8x+16互为相反数,求x2+2xy+y2的值.
已知|x-y+1|与x2+8x+16互为相反数,求x2+2xy+y2的值.
已知│x-y+1│与x2+8x+16互为相反数,求x2+2xy+y2的值.
已知│x-y+1│与x2+8x+16互为相反数,求x2+2xy+y2的值.
1已知│x-y+1│与x2+8x+16互为相反数,求x2+2xy+y2的值
已知x与y互为相反数,且x-y=5.求x2+y2的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知x-y+1,X2+Y2=25 求(x+y)2和x2-xy+y2的值
已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值.
已知x+y=8,xy=12,求x2+y2;(x-y)2的值
已知x+y=4,xy=2,求x2+y2+3xy的值.