How do we prove this expression? x>0, y>0, z>0 x/y + y/z >= 2 I tried expanding, xz + y^2 >= 2yz I see that if x = z, this expression is true, from x^2 + y^2 >= 2xy, but how do we phrase that?
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Am I misreading this ? $\displaystyle \frac{100}{101}+\frac{101}{102},$ (for example) is not greater than or equal to 2.
Hm... i gues question is wrong then. Thxs
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