Ta có: B=−x+4x=3x
x∈(−∞;+∞) do đó 3x không bị chặn ở hai đầu.
Nên B=−x+4x không có giá trị lớn nhất.
B=-x+4x
B=3x
Do x ∈{- ∞;+ ∞}
⇒Không có Bmax
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.