(lg2)^2+lg2*lg5+(lg5)^2=

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/10 18:04:07
(lg2)^2+lg2*lg5+(lg5)^2=(lg2)^2+lg2*lg5+(lg5)^2=(lg2)^2+lg2*lg5+(lg5)^2=(lg2)^2+lg2*lg5+(lg5)^2=2(lg

(lg2)^2+lg2*lg5+(lg5)^2=
(lg2)^2+lg2*lg5+(lg5)^2=

(lg2)^2+lg2*lg5+(lg5)^2=
(lg2)^2+lg2*lg5+(lg5)^2
=2(lg2) + lg(2+5)+2(lg5)
=2(lg2+lg5)+lg7
=2lg(2×5)+lg7
=2lg10+lg7
=2+lg7