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

Toán Lớp 6: co bao nhieu so tu nhien n thoa man 32<2mu n<512

Toán Lớp 6: co bao nhieu so tu nhien n thoa man 32<2mu n<512

Comments ( 2 )

  1. 32 < 2^n < 512
    => 2^5 < 2^n < 2^9
    => 5 < n < 9
    => n ∈ {6;7;8}
    => 2^5 < 2^6;2^7;2^8 < 2^9
    Vậy n ∈ {6;7;8}

  2. 32<2^n <512 (x \in NN)
    =>2^5 < 2^n < 2^9
    => 5<n<9
    =>n \in { 6 ; 7 ; 8 }
    Vậy có 3 số tự nhiên n thỏa mãn .
     

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

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