lg2*lg50-lg5*lg20-lg4 最后答案是-1,

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lg2*lg50-lg5*lg20-lg4 最后答案是-1,
lg2*lg50-lg5*lg20-lg4
最后答案是-1,

lg2*lg50-lg5*lg20-lg4 最后答案是-1,
唉,我都忘了,害我从百度搜了两个公式才会做.
lg2*lg50-lg5*lg20-lg4
=lg2*(lg5+lg10)-lg5*(lg2+lg10)-lg4
=lg2*lg5+lg2*lg10-lg5*lg2-lg5*lg10-lg4
=lg2*lg5-lg5*lg2+lg2-lg5-lg4
=lg2-lg5-lg4
=lg2-(lg5+lg4)
=lg2-lg20
=lg(2/20)
=lg(1/10)
=-1
兄弟,好好学习吧.这种问题争取下次不要拿来了,.

lg2*lg50+lg5*lg20-2lg5*lg2 lg2*lg50-lg5*lg20-lg4 计算 lg5×lg20-lg2×lg50-lg25 lg5 X lg20 - lg2 X lg50 - lg25 lg2·lg50-lg5·lg20-lg4 化简 lg2×lg50+lg25-lg5×lg20 问道对数题 lg2*lg50+lg20*lg5-2lg5*lg2 求值lg2*lg50+lg5*lg20-lg100*lg2*lg5 lg2·lg50-lg5·lg20-lg4=?lg(5^2)+(2/3)lg8+lg5·lg20+(lg^2)2=? lg50+lg2*lg5+lg²2=? lg2*lg50+lg25-lg5*lg20需要过程,谢谢~ lg2*lg50-lg5*lg20-lg4 最后答案是-1, 高一对数计算lg21*lg50+lg25-lg51*lg20=lg2*lg50+lg25-lg5*lg20= lg2·lg50+lg5·lg20-lg100·lg5·lg2=? lg²2+lg50+lg2*lg5怎么解答（步奏 lg^2 2+2lg5+lg2·lg50 （lg5)^2+lg2*lg50 （lg5)²+lg2×lg50