设3a=2,3b=5,试用a,b表示log3√30
问题描述:
设3a=2,3b=5,试用a,b表示log3√30
答
a=log3(2)
b=log3(5)
原式=log3(30^1/2)
=1/2×log3(2×3×5)
=1/2×[log3(2)+log3(3)+log3(5)]
=(a+1+b)/2