Question

Tìm các cặp sô nguyên ab sao cho:

a) a.b=1

b) a.b=3

Answer 1

a) \(a.b=1=1.1=-1.-1\) vậy \(\left\{{}\begin{matrix}\left\{{}\begin{matrix}a=1\\b=1\end{matrix}\right.\\\left\{{}\begin{matrix}a=-1\\b=-1\end{matrix}\right.\end{matrix}\right.\)

b) \(a.b=3=1.3=3.1=-1.-3=-3.-1\)

vậy \(\left\{{}\begin{matrix}\left\{{}\begin{matrix}a=1\\b=3\end{matrix}\right.\\\left\{{}\begin{matrix}a=3\\b=1\end{matrix}\right.\\\left\{{}\begin{matrix}a=-1\\b=-3\end{matrix}\right.\\\left\{{}\begin{matrix}a=-3\\b=-1\end{matrix}\right.\end{matrix}\right.\)