已知,3^a=36,4^b=36
alg3=2lg6
2/a = lg3/lg6
blg4=2lg6
blg2=lg6
1/b=lg2/lg6
2/a + 1/b
= lg3/lg6 +lg2/lg6
= (lg3 +lg2)/lg6
= lg6/lg6
=1