xy>0,证xy+1/xy+x/y+y/x>=4

xy>0,证xy+1/xy+x/y+y/x>=4 xy-1+x-y (xy+1)(x+1)(y+1)+xy (xy+1)(x+1)(y+1)+xy (xy+1)(x+1)(y+1)+xy 分解因式(xy+1)(x+y+xy+1)+xy 已知xy>0,证明xy+xy/1+x/y+y/x>=4 已知xy大于0求证xy+1/xy+y/x+x/y大于等于4 【x(xy-xy)-y(x-xy)】÷3xy |x|/x+y/|y|+xy/|xy|= X>Y XY>0是1/X .(x+y-2)(x+y-2xy)+(xy-1)^2 因式分解xy-x-y+1 xy+x+y+1因式分解 1-x-y+xy 因式分解 因式分解:xy+x+y+1 xy-1+x-y因式分解 xy-x-y+1因式分解