Giúp mik mik cần gấp Mik bí quá rồi Chuyên gia anh giúp tui với

Bài 3. Cho 3,42 gam Al2(SO4)3 vào 50ml dung dịch NaOH thu được 1,56 gam kết tủa và dung dịch X. Nồng độ M của dung dịch NaOH? Bài 4. Cho 200ml dung dịch KOH vào 200ml dung dịch AICI3 1M thu được 7,8 gam kết tủa keo. Nồng độ M của dung dịch KOH? Giúp mk với ><.

Tính % về khối lượng các nguyên tố trong CTHH sau: FeO; Fe3O4; Fe2O3; Fe(OH)2;Fe(OH)3

Giải phương trình 5$\sqrt[]{1+x^{2}}$ = 2($x^{2}$ +2)

you should buy this dictionary -> you had...................................

3. Anabella has been said to be an haunted doll. ~> People.... *

II. Report the statements 13.“I want to leave university and find a job,” said Laura. Laura announced ..................................................................................................... 14. “You should finish your degree first.” said her tutor. Her tutor advised ...................................................................................................... 15. “You’ll never find a good job if you drop out,” her father said. Her father warned..................................................................................................... 16. “I’ll let you stay at my flat until you find a place to live,” said her best friend. Her best friend offered.............................................................................................. 17.“I think you should ask your tutor for advice,” said her sister. Her sister suggested................................................................................................. 18.“I’ll buy you a car when you graduate,” said her grandmother. Her grandmother promised....................................................................................... III. Read the text below and think of the word which best fits each gap. Use only one word in each gap. DANIELA: SKATEBOARD CHAMPION I’ve always (19) ............................... an outdoors kind of girl, and (20) ............................... a kid, I’d get up to all sorts of stuff with my friends - climbing trees and messing about in the woods. As we got older, my friends started doing other things (21) ............................... shopping and listening to music, but I still loved being outside and needed a new challenge. (22) ............................... was my brother who first got me (23) ............................... skateboarding. I’d seen him practicing on his board hour after hour, and to (24) ............................... honest, I used to think it was uncool. But when he showed me some amazing tricks he could do one day, I had to give it a go. I’ve got a competitive streak, so I watched loads of skateboarding clips online and got out on my board whenever I could - even (25) ............................... it was dark - in order to compete (26) ............................... my brother. It obviously paid (27) ............................... because I beat him in a competition last month!

Làm hộ mình bài 1, với bài 2 câu 8 và bài cuối nhé Cảm ơn ạ🙇🏻‍♀️

cho m,n là tổng của 4 số chính phương, chứng minh tích của m,n cũng là tổng của 4 số chính phương

Giúp mình với! Tại sao chỗ này lại ra được vậy?