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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 12: Cho log_6 4= a . Tính log_2 3 theo a` A. (2-a)/a` B. (a-2)/a C. (a+2)/a D. a/(2-a)

Toán Lớp 12: Cho log_6 4= a . Tính log_2 3 theo a
A. (2-a)/a B. (a-2)/a
C. (a+2)/a
D. a/(2-a)

Comments ( 1 )

  1. Giải đáp:
    Ta có log_6 4 = (log_2 4)/(log_2 6) = (log_2 2^2)/(log_2 (2.3))=2/(log_2 2 + log_2 3) = 2/(1 +log_2 3)=> 2/(1 +log_2 3) = a=> 1 + log_2 3 = 2/a$\\$ <=> log_2 3 = 2/a -1$\\$ <=> log_2 3 = (2-a)/a
    => bbA

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222-9+11+12:2*14+14 = ? ( )

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