x+y=10,xy=24,那么2x2+2y2=______.
已知x+y=4,xy=2,则x2+y2+3xy=______.
分解因式:x2-xy-2y2-x-y=______.
分解因式2x2-xy-6y2+7x+7y+3=______.
分解因式:x2-2xy-8y2-x-14y-6=______.
已知x、y是实数且满足x2+xy+y2-2=0,设M=x2-xy+y2,则M的取值范围是______.
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知x2+y2=2,x+y=1,则10xy的值为______.
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知xy=3,x2+xy-2y2=2(x+2y),且x≠-2y,则x+y=______.
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知x2+4x+y2-2y+5=0,则x2+y2=______.
若|x+y-5|+(xy-6)2=0,则x2+y2的值为______.