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= log 2 + log 3²
= log 2 + 2log3
= 0,3010 + 2(0,4771)
= 0,3010 + 0,9542
= 1,2552
b) Log10,5 = Log21/2
= log 21 - log 2
= log3x7 - log 2
= log 3 + log 7 - log 2
= 0,4771 + 0,8451 - 0,3010
= 1,3222 - 0,3010
= 1,0212