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

Toán Lớp 6: Tìm các cặp số nguyên x,y biết : (x-2).(y+3)=11

Toán Lớp 6: Tìm các cặp số nguyên x,y biết : (x-2).(y+3)=11

Comments ( 2 )

  1. Tham khảo:
    ( x – 2 ) * ( y + 3 ) = 11
    => x – 2; y + 3 \in Ư(11) = { -11; -1; 1; 11 }
    Ta có bảng:
    $\begin{array}{|c|c|c|}\hline \text{x – 2}&\text{-11}&\text{-1}&\text{1}&\text{11}\\\hline \text{y + 3}&\text{-1}&\text{-11}&\text{11}&\text{1}\\\hline \text{x}&\text{-9}&\text{1}&\text{3}&\text{13}\\\hline \text{y}&\text{-4}&\text{-14}&\text{8}&\text{-2}\\\hline\end{array}$
    Vậy (x; y) = (-9; -4); ( 1; -14 ); ( 3; 8 ); ( 13; -2 )
    $@Thanh$

  2. (x-2).(y+3)=11
    ->[(x-2=11),(y+3=11):}
    ->[(x=11+2),(y=11-3):}
    ->[(x=13),(y=8):}
    Vậy x=13;y=8

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