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f(x)=ex+sinx+cosx-ax-2,猜到a=1/2(可利用必要性探路),发现f(0)=0。只需说明当a≠1/2时,f'(0)≠0。 ... 烦心 发表于 2021-1-25 20:58
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2025-7-15 14:19 GMT+8
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