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①當x>0時f(x)=1 ②當x<0時f(x)=-1 ③當x=0時f(x)=0
是這樣的 1 x>0 sgn(x)= 0 x=0 -1 x0 所以F(X)=-sgn(x)= 0 x=0 1 x
零點定理和介值定理
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