(1)=________;(2)lg4+lg5lg20+(lg5)2=________.

发布时间:2020-07-31 14:41:20

(1)=________;
(2)lg4+lg5lg20+(lg5)2=________.

网友回答

解:(1)
=+1+
=
=4.
(2)lg4+lg5lg20+(lg5)2
=2lg2+lg5(2lg2+lg5)+(lg5)2
=2lg2+2lg5lg2+2(lg5)2
=2lg2+2lg5(lg2+lg5)
=2(lg2+lg5)
=2.
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