已知x,y∈R,求证:x-xy+y≥x+y-1
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/21 21:08:41
已知x,y∈R,求证:x-xy+y≥x+y-1已知x,y∈R,求证:x-xy+y≥x+y-1已知x,y∈R,求证:x-xy+y≥x+y-1证明：X^2-XY+Y^2>=X+Y-12X^2-2XY+2Y
已知x,y∈R,求证:x-xy+y≥x+y-1
已知x,y∈R,求证:x-xy+y≥x+y-1
已知x,y∈R,求证:x-xy+y≥x+y-1
证明：X^2-XY+Y^2>=X+Y-12X^2-2XY+2Y^2>=2Y+2X-2 两边同时乘以2(X-Y)^2+X^2-2X+1+Y^2-2Y+1>=0 移项凑完全平方项 (X-Y)^2+(X-1)^2+(Y-1)^2>=0
已知x,y∈R,求证:x+y+1≥x+y+xy
已知x,y∈R,求证:x^2+y^2≥xy+x+y-1
已知x,y∈R,求证:x-xy+y≥x+y-1
已知x,y,z∈R,求证:x^2+y^2>=xy+x+y-1
已知x.y∈R,求证x2+y2+1≥x+y+xy
已知x,y∈R,求证（x2+y2）2≥xy(x+y)2
已知x,y∈R,求证：|x＋y|＝|x|+|y|成立的充要条件是xy≥0.
已知X,Y∈R+,且X+Y=1,求证：XY+1/XY≥17/4
已知X,Y∈R+,且X+Y=1,求证：XY+1/XY≥17/4hgfhg
已知x,y∈R,求证x2-xy+y2>=x+y-1
已知x,y ∈R求证|x+y|=|x|+|y|成立的充要条件是xy大于等于0
若xy∈R+ x+y=2 求证1/x+1/y≥2
若xy∈R+ x+y=2 求证1/x+1/y≥2
|x|>1,|y|>1,x,y∈R,求证|（x-y）/（1-xy）|
已知x,y∈R,求证|x+y|=|x|+|Y|成立的充要条件是xy≥0如题.快!加分!
已知x,y属于 R +,且x+2y=1,求证 xy
已知x,y属于正R,且x+2y=1,求证xy=
已知函数f(x)对一切x,y∈R,都有f(x)+f(y)=f((x+y)/(1+xy)),求证f(x)为奇函数RT