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

Toán Lớp 7: 5^x+4-3.5^x+3 = 2.5^11 help me 5 sao

Toán Lớp 7: 5^x+4-3.5^x+3 = 2.5^11
help me
5 sao

Comments ( 2 )

  1. Ta có: 5^(x + 4) – 3 . 5^(x + 3) = 2 . 5^11
    => 5^(x + 3) . 5 – 3 . 5^(x + 3) = 2 . 5^11
    => 5^(x + 3) . (5 – 3) = 2 . 5^11
    => 5^(x + 3) . 2 = 2 . 5^11
    => 5^(x + 3) = 5^11
    => x + 3 = 11
    => x = 11 – 3
    => x = 8
    Vậy x = 8
    Gửi bạn nha

  2. #tnvt
    5^(x+4)-3.5^(x+3)=2.5^11
    =>5^(x+3).5-3^(x+3)=2.5^11
    =>5^(x+3)(5-3)=2.5^11
    =>5^(x+3).2=5^11
    =>5^(x+3)=5^11
    =>x+3=11
    =>x=8
    Vậy x=8
     

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

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