问题标题:
a>b>c求证1/(a-b)+1/(b-c)≥4/(a-c)怎么做.在下才疏学浅请各位兄台多多帮忙.谢谢
问题描述:
a>b>c求证1/(a-b)+1/(b-c)≥4/(a-c)怎么做.在下才疏学浅请各位兄台多多帮忙.谢谢
董炀斌回答:
左边1/(a-b)+1/(b-c)≥2*根号下1/{(A-B)(B-C)}右边,A-C=A-B+B-C≥2*根号下{(A-B)(B-C)},那么4/(a-c)小于等于2*根号下1/{(A-B)(B-C)},所以1/(a-b)+1/(b-c)≥4/(a-c)
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