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

Toán Lớp 6: Tìm số nguyên x, biết: a) -5+x=46 b) -11chia hết cho x+3

Toán Lớp 6: Tìm số nguyên x, biết:
a) -5+x=46
b) -11chia hết cho x+3

Comments ( 2 )

  1. a)
    -5 + x = 46
    x = 46 – (-5)
    x = 46 + 5
    x = 51
    – Vậy x = 51
    b)
    -11 $\vdots$ x+ 3
    => x + 3 ∈ Ư( 11 ) = { 1; -1; 11; -11 }
    x ∈ { -2; -4; 8; -14 }
    – Vậy x ∈ { -2; 4; 8; -14 }
    @Rin

  2. a, – 5 +x =46
    x = 46 – (-5)
    x = 46 +5
    x = 51
    \text{Vậy x = 51}
    b, -11  \vdots  x+3
    => x + 3 ∈ Ư(-11) = {-11;-1;1;11}
    => x ∈ {-14;-4; -2 ; 8}
    \text{Vậy} x ∈ {-14;-4;-2;8}
     

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