Toán Lớp 6: tìm các số nguyên x,y sao cho a) x.y = -2 b)x.y= 9 lm hộ mk nhé cảm ơn
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Toán Lớp 6: tìm các số nguyên x,y sao cho a) x.y = -2 b)x.y= 9 lm hộ mk nhé cảm ơn
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a) x . y = -2
Mà -2 = 1 . (-2) = (-1) . 2
→ (x; y) = (1; -2); (-1; 2); (2; -1); (-2; 1).
b) x . y = 9
Mà 9 = 1 . 9 = (-1) . (-9) = 3 . 3 = (-3) . (-3)
→ (x; y) = (1; 9); (9; 1); (-9; -1); (-1; -9); (3; 3); (-3; -3).
a) x.y = -2
Ta có bảng sau:
$\begin{array}{|c|c|c|}\hline \text{x}&\text{1}&\text{-1}&\text{2}&\text{-2}\\\hline \text{y}&\text{-2}&\text{2}&\text{-1}&\text{1}\\\hline\end{array}$
Vậy (x;y) in {(1;-2),(-1;2),(2;-1),(-2;1)}
b) x.y = 9
Ta có bảng sau:
$\begin{array}{|c|c|c|}\hline \text{x}&\text{1}&\text{-1}&\text{3}&\text{-3}&\text{9}&\text{-9}\\\hline \text{y}&\text{9}&\text{-9}&\text{3}&\text{-3}&\text{1}&\text{-1}\\\hline\end{array}$
Vậy (x;y) in {(1;9),(-1;-9),(3;3),(-3;-3),(9;1),(-9;-1)}
#Mon