若x（y-1)-y(x-1)=4,则x2+y2/2-xy=_____________请尽快,

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若x（y-1)-y(x-1)=4,则x2+y2/2-xy=_____________请尽快,若x（y-1)-y(x-1)=4,则x2+y2/2-xy=_____________请尽快,若x（y-1)-

若x（y-1)-y(x-1)=4,则x2+y2/2-xy=_____________请尽快,
若x（y-1)-y(x-1)=4,则x2+y2/2-xy=_____________
请尽快,

若x（y-1)-y(x-1)=4,则x2+y2/2-xy=_____________请尽快,
x(y-1)-y(x-1)=4
xy-x-xy+y=4
-x+y=4
x-y=-4
(x²+y²)/2-xy
=(x²-2xy+y²)/2
=(x-y)²/2
=(-4)²/2
=8

x（y-1)-y(x-1)=4
xy-x-yx+y=4
y-x=4
...
y2/2什么哦

等于8

函数y=x2+1/x(x X2-4X+4与|Y-1|互为相反数 则【X/Y-Y/X]/(X+Y)等于多少 y=(x-1/X)(X2-1/X2)的导数, 函数y=(x2-x)/(x2-x+1)的值域 若实数x,y满足x2+y2+xy=1,则x+y的最大值是 若实数x,y满足x2+y2+xy=1,则x+y的最大值是 已知x2+y2-2x-6y+10=0,则4/(y+1/x)= 已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-y2-1/2x+y的值如图 y=-x2+x-2分之1 y=x2+x-2分之1 的值域?y=2x2=4x-1分之x2+2x-4 y=1-x2分之x2急啊！求解，谢谢! 若x（y-1)-y(x-1)=4,则x2+y2/2-xy=_____________请尽快, 若实数x,y满足x2+y2+x2y2-4xy+1=0,则(x+y)2的值为 集合{y|y=x2＋1},{x|y=x2+1},{(x,y)|y=x2+1}三者有什么关系,x2代表X的平方 y=(x2+4x+1)/x2+x+1的值域y=(x2+4x+1)/(x2+x+1)的值域注解;2为平方 y=x2-2x+1(-1 y=x2-2x+5(-1 y=x2-2x(-1 y=x/(x2+1) 值域 y=x2(x