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2016, Issue 8
定理若a,b,c,d都是实数,则(a~2+b~2)(c~2+d~2)≥(ac+bd)~2,当且仅当ad=bc时,等号成立。 
柯西不等式 | 二维 | 推广 | 等号成立 | 证明 | 应用
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