问题
解答题
.若A=
|
答案
∵A=
=log342 log333×log34
,B=(33)2 3
×1 3
=32
>1,C=2
-a×a
×a1 2 1 4 a 7 4
=log222 log223
-a1+
+1 2 1 4 a 7 4
=1-2 3
=2 3
.1 3
∴B>A>C.
.若A=
|
∵A=
=log342 log333×log34
,B=(33)2 3
×1 3
=32
>1,C=2
-a×a
×a1 2 1 4 a 7 4
=log222 log223
-a1+
+1 2 1 4 a 7 4
=1-2 3
=2 3
.1 3
∴B>A>C.