職業網球選手~不論過幾年姿勢都一樣漂亮!
Inequality of arithmetic and geometric means - Wikipedia, the free encyclopedia一個字就是...帥! with equality if and only if x = y. This case can be seen from the fact that the square of a real number is always non-negative (greater than or equal to zero) and from the elementary case (a ± b)2 = a2 ± 2ab + b2 of the binomial formula: In other words (...
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