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

Toán Lớp 6: so sánh A ,B biêt A=2 mũ 29 B=5 mũ 39

Toán Lớp 6: so sánh A ,B biêt A=2 mũ 29 B=5 mũ 39

Comments ( 2 )

  1. A = 2^29 < 2^30 = 2^(3*10) = (2^3)^10 = 8^10
    B = 5^39 < 5^40 = 5^(4*10) = (5^4)^10 = 625^10
    Vì 8 < 625 => A<B
    Vậy A<B

  2. có 2<5
    29<39
    => $2^{29}$ < $5^{39}$ 
    => A<B

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

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