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

Toán Lớp 6: tìm BCNN của : a) 22 và 52 . b) 14,21,56 c) 26,34,104

Toán Lớp 6: tìm BCNN của : a) 22 và 52 . b) 14,21,56 c) 26,34,104

Comments ( 2 )

  1. $\text{a)Ta có:}$
    $\text{22 = 2 . 11}$
    $\text{52 = 2² . 13}$
    $\text{⇒ BCNN(22,52) = 2² . 11 . 13 = 572}$
    $\text{b)Ta có:}$
    $\text{14 = 2 . 7}$
    $\text{21 = 3 . 7}$
    $\text{56 = 2³ . 7}$
    $\text{⇒ BCNN(14,21,56) = 2³ . 3 . 7 = 168}$
    $\text{b)Ta có:}$
    $\text{16 = $2^4$}$
    $\text{34 = 2 . 17}$
    $\text{104 = 2³ . 13}$
    $\text{⇒ BCNN(26,34,104) = $2^4$ . 13  . 17 = 3536}$

  2. a) Ta có:
    22=2.11
    52=2^{2}.13
    =>BCN N(22,52)=2^{2}.11.13=572
    b) Ta có:
    14=2.7
    21=3.7
    56=2^{3}.7
    =>BCN N(14,21,56)=2^{3}.3.7=168
    c) Ta có:
    26=2.13
    34=2.17
    104=2^{3}.13
    =>BCN N(26,34,104)=2^{3}.13.17=1768
     

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

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