50% . 10 . 2n . 2k = 240 ( 1) 10 . 2n .( 2^k - 1) = 480 (2) a) Kết quả khi lấy (1) - (2) b) Tìm k ( 2n là bộ lưỡng bội của loài )

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.