Re: 請教一題實數
: 請教一題數學,請大家指點一下,謝謝
S = a_1 + a_2 + a_3 + a_4
a_1 <= (1/3)[S - a_1]
=> 4a_1 <= S
同理4a_2 <= S
4a_3 <= S
4a_4 <= S
=> 4S <= 4S
等號成立在a_1 = a_2 = a_3 = a_4 = S/4
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