Rút gọn rồi so sánh giá trị của M với 1, biết:

$M=\left(\frac{1}{a-\sqrt{a}}+\frac{1}{\sqrt{a-1}}\right):\frac{\sqrt{a}+1}{a-2\sqrt{a}+1}$

với a > 0 và a ≠ 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.