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= 2.log 3 + log10
= 0,9542 + 1
= 1,9542
log45 = log(3^2 x 10/2)
= 2. log3 + log10 - log2
= 0,9542 + 1 - 0,3010
= 1,9542 - 0,3010
= 1,6532
log72 = log(2^3x3^2)
= 3.log2 + 2.log3
= 3 x 0,3010 + 2 x 0,4771
= 0,9030 + 0,9542
= 1,8572