Chứng minh rằng giá trị của biểu thức sau không phụ thuộc vào giá trị của x: $A$= ($\frac{1}{\sqrt{x}-1}$ +$\frac{1}{\sqrt{x}+1}$ ).($\sqrt{x}$ - $\frac{1}{\sqrt{x}}$) với $x$ > 0 và $x$ $\neq$ $1$

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.