lg25+2/3lg8+lg5×lg20+^2=多少?lg2×lg3/lg^2=多少?

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/08 11:15:53
lg25+2/3lg8+lg5×lg20+^2=多少?lg2×lg3/lg^2=多少?

lg25+2/3lg8+lg5×lg20+^2=多少?lg2×lg3/lg^2=多少?
lg25+2/3lg8+lg5×lg20+^2=多少?lg2×lg3/lg^2=多少?

lg25+2/3lg8+lg5×lg20+^2=多少?lg2×lg3/lg^2=多少?
lg25+2÷3×lg8=2lg5+2lg2=2lg10=2
lg5×lg20+(lg2)²=lg5×(2lg2+lg5)+(lg2)²=(lg5)²+2lg5×lg2+(lg2)2=(lg2+lg5)²=1
所以得3