已知函数g(x)=lg[a(a+1)x2-(3a+1)x+3]的值域是R,求实数

题型:解答题

问题:

已知函数g(x)=lg[a(a+1)x2-(3a+1)x+3]的值域是R,求实数a的取值范围.

考点:对数函数的解析式及定义(定义域、值域)
题型:解答题

When Bill is very young, he loves picture. His mother often draws some for him on old pieces of paper. She is very bad at drawing, but bill likes her pictures and always wants more. Then, when he is a little older, Bill’s mother gives him some pencils and a drawing book, and he begins drawing pictures, too. But they are never good .When Bill is five years old, his mother gives him a small blackboard and some pieces of a baby on the blackboard, he draws lines(线条) and rubs(擦) them out too for ten minutes , but when he looks at his picture , he is not happy. “Well”, he says at last(最后) to his mother, “I’ll put a tail(尾巴) on it and make it a monkey.”  

小题1:Bill ___ when he is very young.

A.loves watching TV very much

B.often wants his mother to draw pictures for him

C.likes old pieces of paper very much

D.always wants his mother to buy pictures for him小题2:He is a little older, so his mother gives him ____ and lets him begin drawing pictures .

A.some paper and ink

B.a book and some pens  

C.some pencils and a drawing book

D.a blackboard and some old paper小题3:How old is he when he is trying to draw a baby on the blackboard?

A.He’s five years old

B.He’s fifteen years old

C.He’s fifty years old

D.He’s five like a cat小题4:Bill wants to put a tail in the picture , so _________ .

A.it looks like a duck

B.it looks like a dog

C.it looks like a monkey

D.it looks like a cat小题5:Which of the following sentences is right?

A.Bill’s mother does will in drawing.

B.bill isn’t bad at drawing.

C.There are three people in the story.

D.Bill isn’t happy when he looks at his picture of a baby

题型:解答题
修路队第一周修路
2
5
千米,第二周修路
11
35
千米,两周正好修了全场的
2
7
,这条路长多少千米?
题型:解答题

电厂输煤系统中常用的制动装置有带式逆止器,滚动逆止器,电力渡压制动器和()。

A.风动制动器

B.电磁制动器

C.手动制动器

D.气动制动器

题型:解答题

Alpon综合征时肾小球基底膜哪种胶原蛋白缺乏()

A.Ⅰ型胶原蛋白

B.Ⅱ型胶原蛋白

C.Ⅲ型胶原蛋白

D.Ⅳ型胶原蛋白

E.层连蛋白

题型:解答题

比较群组与组合的异同点。

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