Cho a, b, c là các số thực dương thỏa mãn abc = 1. Chứng minh: $\frac{a}{(ab + a + 1)^{2}}$ + $\frac{b}{(bc + b + 1)^{2}}$ + $\frac{c}{(ac + c + 1)^{2}}$ ≥ $\frac{1}{a+b+c}$

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.