问题
选择题
x=
|
答案
x=
+1 log 1 2 1 3 1 log 1 5 1 3
=
+1 log2-13-1 1 log5-13-1
=
+1 log23 1 log53
=
+lg2 lg3 lg5 lg3
=
=lg2+lg5 lg3
=log310.1 lg3
因为32<10<33,所以x∈(2,3).
故选D.
x=
|
x=
+1 log 1 2 1 3 1 log 1 5 1 3
=
+1 log2-13-1 1 log5-13-1
=
+1 log23 1 log53
=
+lg2 lg3 lg5 lg3
=
=lg2+lg5 lg3
=log310.1 lg3
因为32<10<33,所以x∈(2,3).
故选D.