Rút gọn các biểu thức sau: a)√4(𝑎−3)2 với a≥ 3 b)√9(𝑏−2)2 với b< 2 c)√25𝑥2(1−4𝑦+4𝑦2) với x<0; y>12 d)-2√9(𝑎2+2𝑎+1)2 với a≥-1 Tìm x, a) 3 √𝑥−3=12 b) √16(1−2𝑥)−8=0 c) √4(9−6𝑥+𝑥2)−12= 0

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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.

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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.