设3a=4b=36,则2/a+1/b=_.
问题描述:
设3a=4b=36,则
+2 a
=______. 1 b
答
∵3a=4b=36,∴a=
,b=lg36 lg3
,∴lg36 lg4
+2 a
=1 b
+2lg3 lg36
=lg4 lg36
=1.lg(32×4) lg36
故答案为1.