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[ Math ]
討論串[中學] 對數
共 23 篇文章
內容預覽:
log(5x) * log(x/6) * log(x) + 4 = log(x) + log(3). u = log(x). [u + log(5)][u - log6]u - u + (log(3) + 4) = 0. u^3 - (log(6/5))u^2 - (1 + log(5)log(6)
(還有1個字)
內容預覽:
u = log_2 (α). α = 2^u. u + 2^u - 4 = 0. 2^β + β - 4 = 0. => β = u = log_2 (α). => α + β = 2^u + β. = 2^β + β = 4. 顯然y=/=0. => x = 1. => z = 1/3. => y
(還有168個字)