6x2-5xy-6y2+2x+23y-20.
6x2-5xy-6y2+2x+23y-20.
分解因式:2x2+xy-y2-4x+5y-6.
因式分解 x2+xy-2y2-x+7y-6
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以(x2+y2/x
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(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
X2+Y2+8X+6Y+25=0 求代数式(x2-4y2/x2+4xy+4y2)-x/x+2y
若x+y=5,xy=6,则x2+y2=______.
已知x+y=-5,xy=6,则x2+y2=______.
分解因式2x2-xy-6y2+7x+7y+3=______.
分解因式:x2-2xy-8y2-x-14y-6=______.