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

Toán Lớp 6: A, Tìm số nguyên x, y thỏa mãn ( x-3 ).( y-5 )= -7 B, Tìm số nguyên n sao cho: ( n + 5) chia hết cho (n+3) giúp mình đi

Toán Lớp 6: A, Tìm số nguyên x, y thỏa mãn
( x-3 ).( y-5 )= -7
B, Tìm số nguyên n sao cho:
( n + 5) chia hết cho (n+3)
giúp mình đi

Comments ( 2 )

  1. Giải đáp:
    Lời giải và giải thích chi tiết:
     

    toan-lop-6-a-tim-so-nguyen-y-thoa-man-3-y-5-7-b-tim-so-nguyen-n-sao-cho-n-5-chia-het-cho-n-3-giu

  2. a, (x – 3)(y – 5) = -7
    Ta có bảng sau:
    $\begin{array}{|c|c|c|}\hline \text{x-3}&\text{1}&\text{-1}&\text{7}&\text{-7}\\\hline \text{y-5}&\text{-7}&\text{7}&\text{-1}&\text{1}\\\hline \text{x}&\text{4}&\text{2}&\text{10}&\text{-4}\\\hline \text{y}&\text{-2}&\text{12}&\text{4}&\text{6}\\\hline\end{array}$
    Vậy (x;y) in {(4;-2),(2;12),(10;4),(-4;6)}
    b, 
    Ta có: (n + 5) vdots (n + 3)
    <=> (n + 3) + 2 vdots (n+3)
    Vì (n + 3) vdots (n+3)
    => 2 vdots n+3
    <=> n + 3 in Ư(2) = {±1;±2}
    Ta có bảng sau:
    $\begin{array}{|c|c|c|}\hline \text{n+3}&\text{1}&\text{-1}&\text{2}&\text{-2}\\\hline \text{n}&\text{-2}&\text{-4}&\text{-1}&\text{-5}\\\hline\end{array}$
    Vậy n in {-5;-4;-2;-1}

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

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