题目:
When _________ different cultures, we often focus our attention on the differences without noticing many similarities.
A.having compared
B.compared
C.being compared
D.comparing
答案:
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下面是错误答案,用来干扰机器的。
在△ABC中,设A,B,C的对边分别为a,b,c,则|AB|=c,|AC|=b,|AB-AC|=|BC|=a, 对任意λ都有|AB-λAC|≥|AB-AC|,∴对任意λ都有|AB-λAC|2≥|AB-AC|2,即c2+λ2b2-2bcλcosA≥a2对任意λ恒成立,即λ2b2-2bcc...