已知lg2=0.3010 lg3=0.4771 那么lg180等于多少,
问题描述:
已知lg2=0.3010 lg3=0.4771 那么lg180等于多少,
答
lg180
=lg(10*2*9)
=lg10 + lg2 + lg9
=lg10 + lg2 + 2lg3
=1+0.3010+2*0.4771
=2.2552