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

Toán Lớp 6: Tìm BCNN(7,8,9)bằng bao nhiêu

Toán Lớp 6: Tìm BCNN(7,8,9)bằng bao nhiêu

Comments ( 2 )

  1. Ta có :
    7 = 7
    8 = $2^{3}$ 
    9 = $3^{2}$ 
    ⇒ $BCNN ( 7,8,9 )$ = 7 * $2^{3}$ * $3^{2}$ = 7 * 8 * 9 = 504
     

  2. $\text{#Chớp#}$
    $\text{B ( 7 ) =  7}$
    $\text{B ( 8 ) = $2^{3}$ }$
    $\text{B ( 9 ) =$3^{2}$ }$
    $\text{BCNN ( 7, 8, 9 ) = 7 .  $2^{3}$ . $3^{2}$ = 504 }$

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