在函數(shù)y=lnx的圖像上,到直線2x-y+2=0的距離最近點(diǎn)的橫坐標(biāo)為?復(fù)數(shù)z=√2+i分之1-√2i的共扼復(fù)數(shù)?
在函數(shù)y=lnx的圖像上,到直線2x-y+2=0的距離最近點(diǎn)的橫坐標(biāo)為?復(fù)數(shù)z=√2+i分之1-√2i的共扼復(fù)數(shù)?
數(shù)學(xué)人氣:680 ℃時(shí)間:2019-08-20 23:19:28
優(yōu)質(zhì)解答
y=lnxy'=1/x到直線2x-y+2=0的距離最近點(diǎn)就是與直線平行的切線點(diǎn).那么切線的斜率K=2即:1/X=2,得到X=1/2y=ln1/2=-ln2即點(diǎn)坐標(biāo)是(1/2,-ln2)2.Z=(1-√2i)/(√2+i)=(1-√2i)(√2-i)/【(√2+i)(√2-i)】=(-3i)...
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