lm cho mik 2 bài này nha giải thích nữa đó

Giúp mình với mình đag cần gấp ạ ><

Các anh chị giúp em nhé Gấp lắm rồi

1 ) Cho x + 2y = 5 . Chứng minh rằng : x² + y² ≥ 5 2 ) Cho 3x - 4y = 10 . Tìm GTNN của biểu thức A= x ² + y ²

he was recommened me for the position, which was very nice for him (kind)

V. Fill in each blank with one suitable word from the box to complete the passage. (1 pt) The biggest problem most people face in learning a new (1) __________ is their own fear. They worry that they won’t say things (2) ___________ or that they look stupid, so they don’t talk at all. Don’t do this. The fastest way to learn anything is to do it – again and again until get it right. Like anything, learning English requires practice. Don’t let a little fear stop you (3) _________ getting what you want. Even if you study English at a language school it doesn’t mean you can’t learn outside of class. Using as many different sources, methods and tools as possible; it will allow you to learn faster. There are many different ways you can (4) _______ your English, so don’t limit yourself to only one or two. The Internet is a fantastic resource for virtually anything; but for language learner, it’s perfect. 1. A. language B. English C. subject D. lesson 2. A. correct B. incorrect C. correctly D. incorrectly 3. A. at B. from C. in D. on 4. A. improve B. speak C. say D. tell

cho các chất: Cu, HCl, NaOH, Fe, H2SO3 loãng, Mg. các chất dùng để điều chế khí hidro H2 là

2 vòi nước cùng chảy vào một bể k chứa nước thì sao 8h sẽ đầy.Lúc đầu ng ta cho 2 vòi chảy trong 7h,sau đó khoá vòi 1 lại thì vòi 2 phải chảy thêm 15h nữa mới đầy bể.Nếu vòi 1 chảy thì sau bao lâu mới đày bể?

Viết calli " Nhớ cậu " đẹp, ko app, ko ô li, ko kẻ ngang, ko vi phạm luật, 1 pic kí 1 pic ko kí, ko chụp = mt ~ H ~

66. What is the price of the two notebooks? How