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?

hình học cho tam giác MNP có MN=MP. gọi H kà trung điểm K rao cho HM=HK . chứng minh rằng a,tam giác MHN=tam giác MHP b,MN là tia phân giác của góc NMP c,,MN vuông góc NP d,MN song song PK