Express the given logarithm as a sum and/or difference of logarithms. Simplify, if possible. Assume that all variables represent positive real numbers.log19

A.  log1920 - 2 log19n - 2 log19m
B. log1920 - log19n - log19m
C. 7 log1920 - 2 log19n - log197
D.  log1920 - 2 log19n - log19m

Answer: D

Mathematics

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A. , -  
B. ?
C. - ,  
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