加减凑项法+幂指函数求极限+套路:f-g~f(lnf-lng)~g(lnf-lng)。听TED演讲,看国内、国际名校好课,就在网易公开课
加个条件limx→x0f(x)=0;limx→x0f(x)−g(x)f(x)(lnf(x)−g(x))=limx→x0f(x)...
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常用的等价无穷小量有当X趋近于0时,cosX等价于1吗?你把无穷小量、等价无穷小量的定义搞错了:在自变量的某个变化过程中,以零为极限的变量称为无穷小量;设α与β是同一极限过程中的两个无穷小量,若lim α/β = 1,则称α与β是等价的无穷小量.而 x→0 时,cosx 以 1 为极限,根本就不是一...
allows only a precarious balance to be maintened w ~ l hglucose utilizalion, as reflected by the lastlng decrease o l plasma glucose. This study is the lirst quanl~l~calio0n1 gluconeogenesls at thls age 13-I3CIlaclale and [6.6-2k12]glucose tracers were inlused in 12 lnlants aged ...
allows only a precarious balance to be maintened w ~ l hglucose utilizalion, as reflected by the lastlng decrease o l plasma glucose. This study is the lirst quanl~l~calio0n1 gluconeogenesls at thls age 13-I3CIlaclale and [6.6-2k12]glucose tracers were inlused in 12 lnlants aged ...
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LTRUiIbyAkyKBJi0Gi39FQveZzLu5q8gbkcZ+UW0tYnezjJKA2R3lnGvYcVeqEXM5xx+JUyOaIe6PLOnLth6V2ZUbLpem4ov97roZ7lAHRQK4KcgsNAd5uvVzLiDzXwdljmTp7czxixk9xh6fBYbTsb+PKKaR1SLm89txOdWyXbnVchkNzZcSRR2qJmMCJnQ/QPRZZdZWC2jbQlsM+Z4d1kEo4zn2gXPyfjzBvYXodUqWhUYyjs7LPfvga8KuB0fIG8lMtkDb3v9v9...
法一:h(x)=(f(x))/(g(x))h(a)=(f(a))/(g(a))1,∴f(x)g(x)成立,故C正确,D错误.法二:令F(x)=lnf(x),G(x)=lng(x),φ(x)=F(x)-G(x),∴φ(x)=F(x)-G(x)=(f(x))/(f(x))-(g(x))/(g(x))0,∴φ(x)单调递增,又Φ(a)0,故Φ(x)0,∴F(x)G(x...