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2022-12-02 18:15:06
a) Để tổng x+y đạt giá trị lớn nhất thì \(\left(x,y\right)\in\left\{\left(21;34\right),\left(34,21\right)\right\}\)
b) Để tổng x+y đạt giá trị nhỏ nhất thì \(\left(x,y\right)\in\left\{\left(-14;-23\right),\left(-23,-14\right)\right\}\)
2022-12-02 18:10:52
Ta có:
+\(\dfrac{-15}{3}=-5\) (1)
+\(\dfrac{21}{7}=3\) (2)
Từ (1), (2) => \(-\dfrac{15}{3}< x\le\dfrac{21}{7}\Leftrightarrow-5< x\le3\)
mà \(x\inℤ\)
=> \(x\in\left\{-4;-3;-2;-1;0;1;2;3\right\}\)