已知3^a=4^b=36,求2/a+1/blog25log2(1+lg52)=?log53(log35+log95)lg2=?若log8a+log4b^2=5,log8b+log4a^2=7,试求ab若lg(x^2+4)+lg(y^2+1)-lg8=lgx=lgy,求y/x之值重点是过程,如果单提供过程,最后答案没有也行.