Giải thích các bước giải:
- √2x + √2x+4
=- √2x +√2x+2 ²
=- √2x +2 √2x
= √2x
Hướng dẫn trả lời:
-√2x+√2x+4.
=[(-√2x)+√2x]+4.
=0+4.
=4.
Đáp án:
=-4.
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.