问题
解答题
(1)计算:log23•log34+lg4+lg25 (2)化简:
|
答案
(1)log23•log34+lg4+lg25
=
•lg3 lg2
+2lg2+2lg5lg4 lg3
=
+2(lg2+lg5)lg4 lg2
=
+2lg10=2+2=4;2lg2 lg2
(2)
•m
•3 m 4 m (
)5•m6 m 1 4
=m
•m1 2
•m1 3 1 4 m
•m5 6 1 4
=m
+1 2
+1 3 1 4 m
+5 6 1 4
=
=1.m 13 12 m 13 12