log27/48+log212-1/2log242-2 log23=_.
问题描述:
log2
+log212-
7 48
log242-2 log23=______. 1 2
答
log2
+log212-
7 48
log242-2 log23=log2(1 2
×12÷
7 48
)-3=−
42
−3=-1 2
.7 2
故答案为:−
7 2