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

Toán Lớp 7: (1/2-1/3)x6^x+6^(x+2)=6^15+6^18

Toán Lớp 7: (1/2-1/3)x6^x+6^(x+2)=6^15+6^18

Comments ( 2 )

  1. (1/2-1/3)x6^x+6^(x+2)=6^15+6^18
    ⇔1/6 . 6^x+6^x.36=6^{15}(1 + 6³)
    ⇔6^x. 217/6=6^{15}.217
    ⇔\(6^x=6^{16}\)
    ⇔\(x=16\)

  2. @ThuyKieuCuTo 
    Giải đáp:
    x = 16
    Lời giải và giải thích chi tiết:
    (1/2-1/3) xx 6^x+6^(x+2)=6^15+6^18
    ⇔1/6 . 6^x + 6^x . 6^2 = 6^15 + 6^15.6^3
    ⇔6^x xx (1/6 + 36) = 6^15(1 + 6^3)
    ⇔6^x xx 217/6 = 6^15 . 217
    ⇔6^x  = 6^15 . 217 xx 6/217
    ⇔6^x = 6^16
    ⇒x = 16
    Vậy x = 16

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

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