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A.單調(diào)增函數(shù)

B.單調(diào)減函數(shù)

C.在(0,)上是單調(diào)減函數(shù),在(,5)上是單調(diào)增函數(shù)

D.在(0,)上是單調(diào)增函數(shù),在(,5)上是單調(diào)減函數(shù)

A.f(x)＞g(x)                               B.f(x)＜g(x)

C.f(x)=g(x)                               D.大小關(guān)系不能確定

A.增函數(shù)              B.減函數(shù)           C.有增有減          D.不能判斷增減性

A.b²-4ac≥0            B.b＞0,c＞0          C.b=0,c＞0            D.b²-3ac≤0

A.(2,+∞)             B.(0,2)             C.(,+∞)         D.(0,)

A.(,+∞)            B.(-∞,)         C.(-,+∞)           D.(-∞,-)

A.f(x)在［a,b］上單調(diào)遞增,且f(b)＞0

B.f(x)在［a,b］上單調(diào)遞增,且f(b)＜0

C.f(x)在［a,b］上單調(diào)遞減,且f(b)＜0

D.f(x)在［a,b］上單調(diào)遞增,但f(b)的符號(hào)無(wú)法確定

①單調(diào)增函數(shù)的導(dǎo)數(shù)也是單調(diào)增函數(shù)  ②單調(diào)減函數(shù)的導(dǎo)數(shù)也是單調(diào)減函數(shù)  ③單調(diào)函數(shù)的導(dǎo)數(shù)也是單調(diào)函數(shù)  ④導(dǎo)函數(shù)是單調(diào)的,原函數(shù)也是單調(diào)的

A.0個(gè)                  B.2個(gè)            C.3個(gè)                D.4個(gè)

設(shè)a＞1,函數(shù)f(x)=在R上可導(dǎo).

求:(1)常數(shù)a、b;

(2)f′(x).