lg5(1-lg5)+2lg5根号2+lg2(1-lg5)
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/02 20:08:07
lg5(1-lg5)+2lg5根号2+lg2(1-lg5)
![lg5(1-lg5)+2lg5根号2+lg2(1-lg5)](/uploads/image/z/7445623-31-3.jpg?t=lg5%281-lg5%29%2B2lg5%E6%A0%B9%E5%8F%B72%2Blg2%281-lg5%29)
原式=lg5(lg10--lg5)+lg(5根号2)^2+lg2(lg10--lg5)
=lg5lg2+lg50+lg2lg2
=lg5lg2+1+lg5+(lg2)^2
=lg2(lg5+lg2)+1+lg5
=lg2+1+lg5
=lg10+1
=1+1=2.
=lg5lg2+lg50+lg2lg2
=lg5lg2+1+lg5+(lg2)^2
=lg2(lg5+lg2)+1+lg5
=lg2+1+lg5
=lg10+1
=1+1=2.