√-2x + 6 xác định khi
-2x+6 ≥ 0 → -2x ≥ -6 → x ≤ 3
Vậy √-2x + 6 xá định khi x ≤ 3
Choose the best answer.
I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.
We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.