Giúp mình giải 4 bài này vs Mình đag cần gấp

Giúp mình 3 câu đi mn mình cần gấp lắm

Cho 5,4(g) hỗn hợp 2 kim loại( hóa trị II III ) tác dụng H2SO4(loãng,dư) thu được 10,08(l) khí (đktc).Biết tỉ lệ nguyên tử khối khối lượng kim loại hóa trị II và III là 1:3.Còn tirleej số nguyên tử 3:1 .Tìm tên 2 kim loại đó

Giải hệ phương trình sau: 3x+2=-y -x+4=y

help me pls ～(´ε｀ ) , nhanh nhé ><

các bn lam giúp mk vs mk cần gấp

Tìm x a,5x-8=-23 b, 5.(x-3)+6=x-(21-2x)

Giải hết giúp em với ạ,em đag cần gấp@@, 3h em đi học rồi,và riêng ở phần 3 la mã mọi người giải thích lí do chọn luôn với ạ,mọi người giúp em với T^T !!!!!!!!!

Vẽ cho mình SCP 999(cục slam màu cam siu cute)nha!! Full màu Tradi hay digi chấp nhận hết Mới xem ẻm xong thía ẻm cute quá khum chịu đc ước j mik có 1 ẻm Nếu có bonus thì là đậu mầm nha Ctlhn dành cho ng có bonus

1. Do you go to school on ________ or by bike A. toe B. foot C. knee D. leg 2. Mr Hung is traveling to Ha Noi ________ bus. A. in B. on C. by D. of 3. How ________ is a sandwich? -It’s two thousand dong. A. many B. much C. old D. long 4. Mom: Would you ________ noodles? Lan: Yes, please. A. want B. like C. has D. have 5. She ________ doing aerobics now. A. are B. does C. is D. has 6. My students sometimes ________ their kites. A. play B. fly C. flys D. run 7. Minh often goes ________ in the mountains with Tan and Nga. A. walking B. run C. walk D. walks 8. Tan: What ________ going to the movie theater? Nam: Yes. Good idea. A. on B. in C. about D. to 9. How ________ are they going to stay there? - For 3 days. A. many B. much C. old D. long 10. Let’s ________ camping this weekend. A. going B. goes C. go D. to go 11. What’s the weather ________ in the Fall? A. hot B. cold C. like D. want 12. Teacher: ________ color is your Mom’s hair? Thu: It’s black. A. Where B. How C. When D. What 13. Van: Are there ________ tomatoes in that basket? Mai: Yes, there are. A. a B. an C. any D. some 14. Ba: ________ there any fruit for dinner, Mom? Mom: Yes, there are some bananas and apples. A. Are B. Is C. Have D. Has 15. How ________ homework do you have every day? A. much B. many C. old D. there 16.They_________the bus yesterday. A. don’t catch B. weren’t catch C. didn’t catch D. not catch 17. My sister_________home last night. A. comes B. come C. came D. was come 18. My father_________tired when I _________ home. A. was – got B. is – get C. was – getted D. were – got 19. What_________you_________two days ago? A. do – do B. did – did C. do – did D. did – do 20.Where_________your family_________on the summer holiday last year? A. do – go B. does – go C.did – go D. did – went 21. We_________David in town a few days ago. A. did see B. was saw C. did saw D. saw 22. It was cold, so I_________ the window. A. shut B.was shut C. am shut D.shutted 23. I_________to the cinema three times last week. A.was go B. went C. did go D.goed 24.What_________you_________last weekend? A.were/do B.did/did C.did/do D.do/did 25.The police_________on my way home last night. A. was stop B.stopped C.stops D.stopping 26. The film wasn’t very good. I_________ it very much. A.ẹnjoyed B.wasn’t enjoy C.didn’t ẹnjoyed D. didn’t enjoy 27.The bed was very uncomfortable. I_________sleep very well. A.didn’t B.did C.wasn’t D.not 28. The window was opened and a bird_________into the room. A.fly B. flew C. was flew D.did fly 29. I_________a lot of money yesterday. I_________an expensive dress. A.spend/buy B.spent/buy C.spent/bought D.was spent/bought.