可以左邊乘(x+y+z) , 右邊乘以3。先去掉一些公共項,要證
(x+z)x^2/y + ... >= 2(x^2+ ...)
左邊x^2/y >= 2x-y 等代入可得
可以左邊乘(x+y+z) , 右邊乘以3。先去掉一些公共項,要證
(x+z)x^2/y + ... >= 2(x^2+ ...)
左邊x^2/y >= 2x-y 等代入可得
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