tìm x,y (x-5).(y-7)=1

2 câu trả lời

`(x-5).(y-7)=1`

`=> x - 5 = 1 => x = 6` 

      `y - 7 = 1 => y = 8`

Đáp án:

Ta có $1=1.1=-1.(-1)$

⇒ Ta có bảng sau:

\begin{array}{|c|c|c|}\hline \text{x-5}&\text{1}&\text{-1}\\\hline \text{y-7}&\text{1}&\text{-1}\\\hline \text{x}&\text{6}&\text{4}\\\hline \text{y}&\text{8}&\text{6}\end{array}

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