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首先f(x)為週期為2的奇函數, 所以f(0)=0, f(2)=f(0)=f(-2)=0 f(-1)=f(-1+2)=f(1)=-f(-1) 2f(-1)=0,f(-1)=0 f(1)=f(-1)=0 囙此函數f(x)在【-2,2】上至少有五個根.
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