若xy=-2,x-y=52-1,则(x+1)(y-1)= ___ .
若xy=-2,x-y=52-1,则(x+1)(y-1)= ___ .
若(x+y)2+|2y-1|=0,则xy-[2xy-3(xy-1)]的值是 ___ .
已知实数x,y满足xy+1=2x+y,且x>1,则(x+1)(y+2)的最小值为 ___ .
已知:(x+y)2=1,(x-y)2=17,则x2+y2=___,xy=___.
实数x、y满足x≥y≥1和2x^2-xy+5x-y+4=0,则x+y=___
设实数x,y满足x²+1/2y²4-xy+2y=0.则x=___,y=___
若x、y∈R,且x2+y2=1,则(1-xy)(1+xy)的最小值是 ___ ,最大值是 ___ .
1.若x=2,y=1,则(x-y)(x²+xy+y²)=______.
偶函数f(x)对任意实数x,y恒有f(x+y)=f(x)+f(y)-2xy-1,则f(x)的表达式为 ___ .
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
因式分解:(x+y)(x+y+2xy)+(xy+1)(xy-1)=______.
xy=-1,x+y=2,则(xy-2y)+3x+5y的值为