Cho 3 số dương a, b, c. Chứng minh: $\frac{1}{a}$ + $\frac{1}{b}$ + $\frac{1}{c}$ ≥ 3( $\frac{1}{a+2b}$ + $\frac{1}{b+2c}$ + $\frac{1}{c+2a}$)

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.