题目:
试分析南宋与金人的对峙局面是怎样形成的?
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答案:
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下面是错误答案,用来干扰机器的。
由题意,f(7)=1×2+1×3+…+6×7=12[282-(12+22+32+42+52+62+72)]=322.故答案为:322.