放缩不等式推导文章来源:https://www.toymoban.com/news/detail-420832.html
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1)\ a^x>x+1\left(1<a\leq e,x<0;a\geq e,x>0\right);
1) ax>x+1(1<a≤e,x<0;a≥e,x>0);
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proof:
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f_{01}\left(x\right)=a^{x}-\left(x+1\right)\Rightarrow f_{01}^{'}\left(x\right) = a ^{x} \ln a-1
f01(x)=ax−(x+1)⇒f01′(x)=axlna−1
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1<a\leq e,x<0\\\Rightarrow0<a^{x}<1,0<\ln a\leq1\\\Rightarrow f_{01}\left(x\right)>f_{01}\left(0\right)=1-1=0\\\Rightarrow a^{x}>x+1\left(1<a\leq e,x<0\right);
1<a≤e,x<0⇒0<ax<1,0<lna≤1⇒f01(x)>f01(0)=1−1=0⇒ax>x+1(1<a≤e,x<0);文章来源地址https://www.toymoban.com/news/detail-420832.html
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