Cho biểu thức: A = ($\frac{1}{\sqrt{a} -3 }$ + $\frac{1}{\sqrt{a} +3 }$ )(1-$\frac{3}{\sqrt{a} }$ ) a) Rút gọn biểu thức A. b) Xác định giá trị của a để A >. $\frac{1}{2}$

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.

Choose the best answer.

We should decorate our living room with _____ orange banner. We also need ________  ribbons, balloons, party hats and costume.

Choose the best answer.

I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.