Cho dãy số (un) được xác định bởi: u1 = 1, u2 = 3 và un+1 = 2un – 3un-1 + 3n2 – 5n (n 2). Tính (ghi chính xác kết quả): u41 ; u42 ; u43 ; u44 ; …

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.