$\sqrt{-4a+1}$
ĐKXĐ: $-4a+1 \ge 0$
$⇔ -4a \ge -1$
$⇔ a \le \dfrac14$
√(-4a + 1) có nghĩa khi:
-4a + 1 ≥ 0
⇔-4a ≥ -1
⇔ a < $\frac{1}{4}$
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.