问题
解答题
设a＞0，b＞0，c＞0，求证：
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答案
证明：∵a＞0，b＞0，c＞0，
，∴
+bc a
≥2ac b
=2c
•bc a ac b
，
+ac b
≥2ab c
=2a
•ac b ab c
，
+ab c
≥2bc a
=2b
•ab c bc a
相加可得：∴
．
+bc a
+ac b
≥a+b+cab c
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设a＞0，b＞0，c＞0，求证：
|
证明：∵a＞0，b＞0，c＞0，
，∴
+bc a
≥2ac b
=2c
•bc a ac b
，
+ac b
≥2ab c
=2a
•ac b ab c
，
+ab c
≥2bc a
=2b
•ab c bc a
相加可得：∴
．
+bc a
+ac b
≥a+b+cab c
| 补全对话。根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。 | |
| M: Why do you look unhappy these days? W: Because 1______ M: Are you serious? Is it true? 2______ W: I don't care about the scores, but I didn't find out 3______. Maybe I don't work hard. M: 4______ W: Yes, I spent the whole weekend on my lessons. M: You'd better 5______
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