(1)lg(x－10)；(2)log_(x－1)(x+2)；(3)log_(x+1)(x－1)².

(1)lg1000；(2)log₂1024；(3)log_0.110；(4)log_3.512.25.

(2)将3^－3=化成对数式；

(3)已知log₄x=－,求x；

(4)已知log₂(log₃x)=1,求x.

A.0个                                                             B.1个

C.3个                                                             D.无穷多个

A.log₃10                                                          B.lg3

C.10³                                                               D.3¹⁰

A.a＞5或a＜2                                                B.2＜a＜5

C.2＜a＜3或3＜a＜5                                     D.3＜a＜4

A.零和负数没有对数

B.任何一个指数式都可化为对数式

C.以10为底的对数叫做常用对数

D.以e为底的对数叫做自然对数