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  1. ... curve passes through (81, 3), so we have 3 = a + log_b (81) ...[2] Consider [2] - [1]: 3 = log_b (81) - log_b (3) 3 = log_b (3⁴) - log_b (3) 3 = 4 log...

    分類:科學及數學 > 數學 2021年01月04日