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函数y=e-x的单调增区间是？
函数y=e-x的单调增区间是？
2025-03-15 09:52:22
推荐回答（1个）
回答1：
求导 y'=e^x-e^(-x)>0 e^x-1/e^x>0 两边乘 e^x e^2x-1>0 e^2x>1 2x>0 x>0 同理,y'
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