Đáp án:
a-4b
= ( `√a` + 2`√b` ) (`√a` - 2`√b` )
Đáp án+Giải thích các bước giải:
`a-4b=(\sqrt{a}-2\sqrt{b})(\sqrt{a}+2\sqrt{b})`
HĐT: `a²-b²=(a-b)(a+b)`
vấn đề cạnh tranh thương hiệu trong xuất khẩu cafe việt nam ra thị trường thế giới
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.