Cho các số thực x,y,z thoả mãn x$\geq$ 1,y$\geq$ 2,z$\geq$ 3 CMR: $x^{2}$ + $y^{2}$ + $z^{2}$ + xy + yz +xz +25$\geq$ 7x+8y+9z

muốn pha100ml dung dịch h2so4 3M thì số mol H2SO4 cần lấy là

Vẽ hình minh họa các ý trên nha 😙😙😙

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COLLOCATIONS and EXPRESSIONS. Complete the sentences with the words below: in - go - eating - order - diet - bite - out of - set 1.It's very expensive to buy fruit that is …………out of …………… seasons. 2.A balanced ……………………… contains all the vitamins the body needs. 3.Stella is going to ……………………… the table for dinner. 4.I ate so much on holiday that I will have to ……………………… on a diet 5.Would you like a quick ……………………… to eat before we leave? 6.After his heart operation, the doctors said he must change his ……………………… habits. 7.You will have no trouble getting tomatoes now because they are ……………………… season. 8.We are all hungry, so let's look at the menu and ……………………… a meal.

11. Penny (live)......................here ever since she (arrive).....................from England. 12. Decorating is difficult, but I (finish)................ painting the kitchen and now I (do) .................the living room. 13. This exercise (look)...................difficult. You (do)....................one like this before? 14. I (wait).................for you here for ages! Why (you not phone)...................me earlier? 15. (You still do)........................your homework? I (finish).......................mine ages ago. 16. We (walk)........................................ for three hours and are very tired. 17. The city is now crowded with people who (seek) ......................for employment 18. Think carefully. I'm sure you (find)...........................out the answer. 19. Either my parents or my brother (be)............................here with me last night. 20. Linda has lost her passport again. It's the second time this .......................... (happen) 21. I don't feel like ............... out this evening. I .....................in the garden all day. (go/ work) 22. The sky is very dark. I think it ....................... (rain) 23. David ..................... his hands. He ........................... the television set.(wash / just repair) 24. Come to see me at 5 this afternoon. I .......................... home until 4.30. (not arrive) 25. .......................... , please! The baby .......................... (not talk / sleep) 26. It ........................ hard. We can’t do anything until it ........................ (rain / stop) 27. Would you mind ....................... on the light? I hate ..................... in a dark room. (turn / sit) 28. She (recommend) ………(study)………. more English before enrolling at the university. 29. John admitted (surprise) ……… by the unexpected birthday party last night. 30. The days (go) ……… when each nation (be) ………. like an island