A.1                B.2                   C.3                D.4

A.14                B.8                 C.22                D.27

A.GF             B.G=F              C.FG             D.F∩G=

(1)log₂3.4,log₂8.5;

(2)log_0.31.8,log_0.32.7;

(3)log_a5.1,log_a5.9(a＞0,a≠1).

(2)已知函数y=log_a［x²+(k+1)x-k+］(a＞0,且a≠1)的值域为R,求实数k的取值范围.

                         图2-2-1

(2)作出函数y=|log₄x|-1的图象.

(1)log₃1.9,log₃2;             (2)log_0.90.1,log_0.92;

(3)log₃5,log₅3;                (4)log₂3,log₀.32;

(5)log_aπ,log_a3.141.