发布网友 发布时间:2024-10-24 15:17
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热心网友 时间:2024-11-06 08:50
2/b = 1/a + 1/c => 1/b - 1/c = 1/a - 1/b => (c-b)/bc = (b-a)/ab => (b-a)/(c-b) = ab/bc = a/c