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一个三位数除以三位数三个数字的和,商要最大.这个三位数是
人气:411 ℃ 时间:2019-10-19 09:22:53
解答
设三位数ABC(100A + 10B + C) ÷ (A + B + C)= (10A + 10B + 10C + 90A - 9C)÷ (A + B + C)= 10 + 9(10A - C)÷ (A + B + C)对(10A - C)÷ (A + B + C)显然C最小时,分子最大,分母最小,因此取C = 0(10A - C)÷ (A + ...
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