问题
填空题
(1)
(2)log48=______; (3)lg
|
答案
(1)原式=
=mm
•m5 6 1 4 m
•m1 2
•m1 3 1 4
+5 6
-1 4
-1 2
-1 3
=m0=1;1 4
(2)原式=
=lg23 lg22
;3 2
(3)原式=lg
+0=2×5
lg10=1 2
.1 2
故答案分别为1;
;3 2
.1 2
(1)
(2)log48=______; (3)lg
|
(1)原式=
=mm
•m5 6 1 4 m
•m1 2
•m1 3 1 4
+5 6
-1 4
-1 2
-1 3
=m0=1;1 4
(2)原式=
=lg23 lg22
;3 2
(3)原式=lg
+0=2×5
lg10=1 2
.1 2
故答案分别为1;
;3 2
.1 2