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中《代数》（下册）（人教社，１９８７年１月第２版）３３页的第１１道复习参考题为：已知：ａ２１＋ａ２２＋ａ２３＋…＋ａ２ｎ＝１，ｘ２１＋ｘ２２＋ｘ２３＋…＋ｘ２ｎ＝１，求证：ａ１ｘ１＋ａ２ｘ２＋ａ３ｘ３＋…＋ａｎｘｎ≤１．该题连续运用基本不等式“２ａｂ...
The “Algebra” (Volume 2) (Ren Jiaosha, 2nd edition, January 1987) The 33rd page of the 11th review review title is: Known: a21+a22+a23+...+a2n=1, x21+x22+x23+...+x2n=1, verification: a1x1+a2x2+a3x3+ ...+anxn≤1. This question continuously uses the basic inequality “2ab...