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= log (9×2)
= log (3²×2)
= log 3² + log 2
= 2 log 3 + log 2
= 2 (0,4771 + 0,3010
= 1,2552
log 21
= log (3×7)
= log 3 + log 7
= 0,4771 + 0,8451
= 1,3222
log 10,5
= log (21/2)
= log 21 - log 2
= log (3×7) - log 2
= log 3 + log 7 - log 2
= 0,4771 + 0,8451 - 0,3010
= 1,0212
log 1/7
= log 7⁻¹
= - log 7
= - 0,8541