发布网友 发布时间:2024-10-24 07:22
共2个回答
热心网友 时间:2024-11-02 21:14
原式=lg(5^2) + lg2(lg50 + lg2)
=2lg5 + lg2[lg(50×2)]
=2lg5 + lg2lg100
=2lg5 + (lg2)×2
=2×(lg5 + lg2)
=2×[lg(5×2)]
=2×lg10
=2×1
=2
热心网友 时间:2024-11-02 21:15
=lg25+lg2*(2-lg2)+(lg2)∧2
=lg25+lg4-(lg2)∧2+(lg2)∧2
=lg25+lg4
=2