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

Toán Lớp 6: giải toán B = {x ∈ N | 5 ≤ x ≤ 7}

Toán Lớp 6: giải toán B = {x ∈ N | 5 ≤ x ≤ 7}

Comments ( 2 )

  1. $\text{B = { x ∈ N | 5 ≤ x ≤ 7 }}$
    $\text{⇒ x ∈ { 5 ; 6 ; 7 } }$
    $\text{ ⇒ B = { 5 ; 6 ; 7 }}$
    $\text{Vậy B = { 5 ; 6 ; 7 } }$

  2. @5<=x
    =>x in {5; 6; 7; 8;…}
    @x<=7
    =>x in {7; 6; 5; 4;…}
    Mà 5<=x<=7
    =>x in {5; 6; 7}
    Vậy B={5; 6; 7}
     

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