数学题若3^a=5^b=m,且1/a+1/b=2,则m=???
若3^a=5^b=m,且1/a+1/b=2,则m=???
1/a=log(m)3 ( m为底数,下同) 1/b=log(m)5 1/a+1/b=log(m)3+log(m)5=2 log(m)15=2 m=√15