对数:log(4)8-log(1/9)3 求值

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对数:log(4)8-log(1/9)3求值对数:log(4)8-log(1/9)3求值对数:log(4)8-log(1/9)3求值log(4)8-log(1/9)3=lg8/lg4-lg3/lg1/

对数:log(4)8-log(1/9)3 求值
对数:log(4)8-log(1/9)3 求值

对数:log(4)8-log(1/9)3 求值
log(4)8-log(1/9)3
=lg8/lg4-lg3/lg1/9
=lg2×4/2lg2-lg3/(-2×lg3)
=4/2+1/2
=5/2