作业帮求值lg2*lg50+lg5*lg20-lg100*lg2*lg5
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求值lg2*lg50+lg5*lg20-lg100*lg2*lg5
求值lg2*lg50+lg5*lg20-lg100*lg2*lg5
求值lg2*lg50+lg5*lg20-lg100*lg2*lg5
lg2·lg50+lg5·lg20-lg100·lg5·lg2
=lg2*(lg10+lg5)+lg5*(lg2+lg10)-2*lg5*lg10*lg2
=2*lg2*lg5+lg2*lg10+lg5*lg10-2*lg5*lg2
=lg2+lg5
=1
注意到其中lg10=1
求值lg2*lg50+lg5*lg20-lg100*lg2*lg5
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
(lg5)^2+lg2*lg50 求值
问道对数题 lg2*lg50+lg20*lg5-2lg5*lg2
1：求值（lg5)平方+lg2×lg50
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=?
（lg5)^2+lg2*lg50
（lg5)²+lg2×lg50
lg5*lg20+(lg2)^
(lg2)^2+lg5*lg20