第1个回答 2017-11-01
19、log₅³⁵+2log(½)√2-log₅(1/50)-log₅¹⁴
=log₅³⁵+log(½)²+log₅⁵º-log₅¹⁴
=(log₅⁷+log₅⁵)-log₂²+(log₅²⁵+log₅²)-(log₅⁷+log₅²)
=log₅⁵-log₂²+log₅²⁵
=1-1+2
=2
18、(lg√27+lg8-3lg√10)/lg1.2
=(3lg√3+3lg2-3lg√10)/lg1.2
=3•(lg√3+lg2-lg√10)/lg1.2
=3•lg(√3•2/√10)/lg1.2
=3•lg(√12/√10)/lg1.2
=3•lg√1.2/lg1.2
=3/2•lg1.2/lg1.2
=3/2
=log₅³⁵+log(½)²+log₅⁵º-log₅¹⁴
=(log₅⁷+log₅⁵)-log₂²+(log₅²⁵+log₅²)-(log₅⁷+log₅²)
=log₅⁵-log₂²+log₅²⁵
=1-1+2
=2
18、(lg√27+lg8-3lg√10)/lg1.2
=(3lg√3+3lg2-3lg√10)/lg1.2
=3•(lg√3+lg2-lg√10)/lg1.2
=3•lg(√3•2/√10)/lg1.2
=3•lg(√12/√10)/lg1.2
=3•lg√1.2/lg1.2
=3/2•lg1.2/lg1.2
=3/2
第2个回答 2017-11-01
6题。3*2=6追答
图二等于1.5没过程，打不出来符号
最后题等于2
追问图二是先化简分子吗
追答嗯
追问图一怎么化成同底数呢
追答lg9/lg3 x lg8/lg3
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