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

Toán Lớp 6: x.(2y+1)=8 tìm số nguyên x,y nha

Toán Lớp 6: x.(2y+1)=8
tìm số nguyên x,y nha

Comments ( 1 )

  1. x * ( 2y + 1 ) = 8
    => x; 2y + 1 \in Ư(8) = { -8; -4; -2; -1; 1; 2; 4; 8 }
    Bảng:
    $\begin{array}{|c|c|c|}\hline \text{x}&\text{-8}&\text{-4}&\text{-2}&\text{-1}&\text{1}&\text{2}&\text{4}&\text{8}\\\hline \text{2y + 1}&\text{-1}&\text{-2}&\text{-4}&\text{-8}&\text{8}&\text{4}&\text{2}&\text{1}\\\hline \text{y}&\text{-1}&\text{-0,5}&\text{-1,5}&\text{-3,5}&\text{3,5}&\text{1,5}&\text{0,5}&\text{0}\\\hline\end{array}$
    Mà x; y \in Z
    => ( x; y ) = ( -8; -1 ); ( 8; 0 )
    $@Thanh$

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