【单选题】幂指函数y=[f(x)]g(x)在求导时,可运用对数法:在函数解析式两边求对数得lny=g(x)lnf(x),两边同时求导得 =g'(x)lnf(x)+g(x) ,于是y'=[f(x)] g(x) [g'(x)lnf(x)+g(x) ],运用此方法可以探求得知 的一个单调递增区间为 [ ]
【单选题】The old man had a heart problem and needed________to the hospital right away. A. going B. to go C. went D. goes
【简答题】函数y=f(x) g(x) 在求导数时,可以运用对数法:在函数解析式两边求对数得lny=g(x)lnf(x),两边求导数 y′ y =g′(x)lnf(x)+g(x) f′(x) f(x) ,于是y'=f(x) g(x) [g′(x)lnf(x)+g(x) f′(x) f(x) ] .运用此方法可以探求得知 y= x 1 x (x>0) 的一个单调增区间为______.
【单选题】I often saw some kids the dog and went away. A. kick B. kicking C. to kick D. kicks
【简答题】我们把形如y=f(x) φ(x) 的函数称为幂指函数,幂指函数在求导时,可以利用对数法:在函数解析式两边求对数得ln y=φ(x)lnf(x),两边求导得 =φ′(x)·ln f(x)+φ(x)· ,于是y′=f(x) φ(x) [φ′(x)·ln f(x)+φ(x)· ].运用此方法可以探求得y=x 的单调递增区间是________.
【单选题】幂指函数y=f(x) g(x) 在求导数时,可以运用对数法:在函数解析式两边求对数得 ,两边求导数得 = ,于是y′=f(x) g(x) · .运用此法可以探求得知y= 的一个单调递增区间为( ).
【简答题】... and went away to live simply ---- on a small farm, in a quiet village, in a hermit's cave. (para.5)
【简答题】A very promising football player back home.,Kamte decided to...... to Golf and turned professional in 2002. The cabbages have already started to...... and we have to throw them away. Many elderly peop...