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

Toán Lớp 6: Tìm x: a. x ⋮ 10 , x ⋮15 , x < 100

Toán Lớp 6: Tìm x:
a. x ⋮ 10 , x ⋮15 , x < 100

Comments ( 2 )

  1. Ta có :

    \text{x ⁝ 10 ; x ⁝ 15 mà x < 100 ⇒ x ∈ BC(10,15)}

    {:(10=2.5),(15=3.5):}}=>BCN N(10,15)=2.3.5=30

    \text{BC(10,15) = B(30) = { 0; 30; 60; 90; 120; …}}

    \text{Mà x < 100 ⇒ x ∈ { 0; 30; 60; 90 }}

    \text{# Mạc}

     

  2.    a. x $\vdots$ 10, x $\vdots$ 15, x < 100

    x $\vdots$ 10, 15 nên x là bội chung của 10, 15

     ta có :

    10 = 2. 5

    15 = 3. 5

    BCNNN ( 10, 15 ) = 2. 3. 5 = 30

    BC ( 10, 15 ) = B ( 30 ) = { 0, 30, 60, 90, 120,…..}

    Vì x <100 nên x $\in$ {0, 30, 60, 90}

     

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