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分別設這5個數為: a-2d a-d a a+d a+2d 因為和是5,所以5a=5,a=1 然後這5個數就變成了 1-2d 1-d 1 1+d 1+2d 然後把他們每一個都平方以後加起來等於165,我相信你會解下去了
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