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13问答网 > y=x和y=lnx图像有几个交点

y=x和y=lnx图像有几个交点

2025-03-15 10:59:47

推荐回答（2个）

回答1：

y=x x任意实数,y=lnx定义域x>0;
f(x)=x-lnx,求导 f'(x)=1-1/x;
01时单增;
f(1)=1;
x-lnx的值始终大于等于1，不可能相等，0个交点

回答2：

0个交点。。。。。。。。。。。

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