Đáp án+Giải thích các bước giải:
$x^{2}$ +$2x$+$1$
= $(x+1)^{2}$ HĐT số 1
= $(x+1)(x+1)$
`x^2+2x+1`
`=x^2+2.x.1+1^2`
`=(x+1)^2`
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.