设X>=1 Y>=1证明X+Y+1/XY

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设X>=1Y>=1证明X+Y+1/XY设X>=1Y>=1证明X+Y+1/XY设X>=1Y>=1证明X+Y+1/XY证明:移项:1/XY-1/X-1/Y

设X>=1 Y>=1证明X+Y+1/XY
设X>=1 Y>=1证明X+Y+1/XY

设X>=1 Y>=1证明X+Y+1/XY
证明:
移项:1/XY-1/X-1/Y