lg36-lg4= lg36 x lg9= 2lg5÷3lg2= lg根号3= log2 56 - log2 7 (2是底数)
问题描述:
lg36-lg4= lg36 x lg9= 2lg5÷3lg2= lg根号3= log2 56 - log2 7 (2是底数)
急死..
答
lg36-lg4=lg9=2lg3 lg36 x lg9=2lg6 x2 lg3=4lg6lg3 2lg5÷3lg2=(2/3)log(2)5 lg√3=(1/2)lg3 log(2) 56 - log(2) 7=log(2)8=3