Chứng minh các đẳng thức sau:
1=a+aa+1.1-a-aa-1=1-a với a≥0 và a≠1
= (1 + √a)(1 - √a)
= 1 - (√a)2 = 1 - a = VP (đpcm)
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.
We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.