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

Toán Lớp 6: Tìm x,y thuộc Z a) (x-3)(y+2) = 7 b) (2x-1) (y-4) = 4 c) xy – 2y + x + 5 = 0

Toán Lớp 6: Tìm x,y thuộc Z
a) (x-3)(y+2) = 7
b) (2x-1) (y-4) = 4
c) xy – 2y + x + 5 = 0

Comments ( 1 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    $\text{a) (x – 3)(y + 2) = 7}$$\\$$\text{$\Rightarrow$ (x – 3) $\in$ Ư(7); (y + 2) $\in$ Ư(7)}$$\\$$\text{$\Rightarrow$ (x – 3) $\in$ {$\pm$7; $\pm$1}}$$\\$$\text{(y + 2) $\in$ {$\pm$7; $\pm$1}}$$\\$Ta có bảng sau:$\\$\begin{array}{|c|c|c|}\hline \text{x – 3}&\text{-7}&\text{-1}&\text{1}&\text{7}\\\hline \text{y + 2}&\text{-1}&\text{-7}&\text{7}&\text{1}\\\hline \text{x}&\text{-4}&\text{2}&\text{4}&\text{10}\\\hline \text{y}&\text{-3}&\text{-9}&\text{5}&\text{-1}\\\hline\end{array}$\\$Vậy các cặp số $\text{(x; y)}$ nguyên là $\text{(-4; -3); (2; -9); (4; 5); (10; -1)}$

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