lg300/7+lg700/+lg100=?
问题描述:
lg300/7+lg700/+lg100=?
具体部聚
答
lg(300/7)+lg700/+lg100 =lg300-lg7+lg700+lg100 =lg3+lg100-lg7+lg7+lg100+lg100 =lg3+2+2+2 =6+lg3 或=6+0.4771=6.4771