Tìm x biết: 9x2=-12
9x2=-12⇔3x2=12
⇔ |3x| = 12 ⇔ |x| = 4
⇔ x1 = 4 và x2 = -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.