tìm x,y nguyên biết: a) 5x−y=13 b) 23x+53y= 109 c)12x−5y=21 d)12x+17y=41

Từ các chất Al, AlCl3, Al(OH)3, Al2O3 hãy sắp xếp thành dãy biến hóa Mọi người giúp mình đang cần gấp

Làm nhanh hộ em nhé cảm ơn mọi người

So sánh: 30^{141} ....... 29^{138}

Calli: Sinh học _Hóng mấy idol_

Viết 1 đoạn văn nói về những việc làm của các thành viên trong gia đình bằng tiếng anh

1: Một dung dịch chứa 0,02 mol Cu2+, 0,03 mol K+, x mol Cl– và y mol SO42–. Tổng khối lượng các muối tan có trong dung dịch là 5,435 gam. Giá trị của x và y lần lượt là : A. 0,03 và 0,02. B. 0,01 và 0,03. C. 0,02 và 0,05. D. 0,05 và 0,01. Giải ra giúp mình nha !!

Exercise 2: Write a paragraph about your daily activities: *Cues: + In the morning: - time to get up?/ have breakfast?/ go to school? - time the class starts / finishes? - things you do after school? + At noon: - lunch time? - things you do after lunch? + In the afternoon: - things/work you do in the afternoon? + In the evening: - dinner time? - things you do after dinner? - time to go to bed?

Làm nhanh giúp em với ạ, xin cảm ơn trước ạ !🤧

3.I can't find my notebook. Somebody __________________ it! (1 Point) has moved moved is moving 4.He __________ piano lessons when he ____________ a teenager. (1 Point) takes / is took /was has taken/was 5.Anne: Did you like the film “Lord of the Rings?” Mary: “Yes, I _________ it several times.” (1 Point) see saw have seen 6.Paul: “_________________ to London” Nam: “No, not yet. What it’s like” (1 Point) Are you going Did you go Have you ever been 7.John __________________ home when he went to college. (1 Point) leaves left has left 8.Modern medicine ___________________ the lives of millions of people. (1 Point) save are saving has saved 9.They __________ a volunteer project to help children in mountainous areas a few years ago. (1 Point) started have started start 10.I (wash) the dishes yesterday, but I (have) no time yet to do it today. (1 Point) washed - had have washed - have had washed - have had 11.I (not/ see) Peter since I (arrive) last Tuesday.Immersive Reader (1 Point) didn't see - arrived haven't seen - arrived haven't saw - arrived