tính tổng: a+3 ≤x≤a+2018 (a∈N)

chỉ có thể tổ chắc liên kết sau khi tất cả các bảng đều có dữ liệu đúng hay sai ?? CHO EM HỎI LÀ VÌ SAO Ạ GIÚP EM VỚI LÀM ƠN

Tìm phương trình đường thẳng∆ đối xứng với ∆ :2x-3y+1=0 qua ∆ 2x-3y+6=0

Lúc 7h có một ô tô đi từ A đến B, cùng lúc đó ô tô thứ hai từ B đến A với vận tốc bằng vận tốc của ô tô thứ nhất và chúng găp nhau lúc 9h. Tính vận tốc của mỗi ô tô biết quãng đường AB dài 250km.

Giải các phương trình sau: a) 7-28x² =0 b) 9x⁴+8x²-1=0 c) 2x²-3(căn 5-2) x +3căn 5 =0 Giúp mình với mình đang cần gấp.mình cảm ơn trước nha

Mấy bạn giải giùm mình vs 20 phút nữa hết h rồi. Thank mấy bợn giải dùm nha

1.Give the correct form of the verb in the brackets Ex: If you.............(arrive) ten minutes carlier ,you would have got a seat. had arrived Ex: If hebworked more slowly,he...........(not make) so many mistakes. Woukd not make/wouldn't make 1.If you......(arrive) ten minutes earlier, you would have got a seat. 22.If he worked more slowly,he....(not make) so many mistakes. 3.I shouldn't drink that wine if I .....(be) you. 4.If I.....(Find) a chesp rooom ,I will stay a fortnight. 5.A lot of people.......(be) out of work if the factory closed down Giup minh voi minh nop gap

Cho tam giác ABC, kẻ BD vuông góc với AC, kể CE vuông góc với AB. Trên tia đối của tia BD, lấy điểm H sao cho BH = AC. Trên tia đối của tia CE, lấy điểm K sao cho CK = AB. Chứng minh rằng Ah = Ak.

Thuyết minh về một giống vật nuôi

2 Hoa / measure / height / weigh / the scale / the moment. ....................................................................................................................................................... 3. Mr.Lam / now wear / face mask / protect him / breathe / dust ....................................................................................................................................................... 4. last year / brother / work / engineer / printing factory ....................................................................................................................................................... 5. what / wide / the West Lake? ....................................................................................................................................................... 6. this morning / I / eat / bread / and / drink milk / breakfast. ....................................................................................................................................................... 7. “ balanced diet” / mean / you / eat / variety / foods / without / eat / much / anything. ....................................................................................................................................................... 8. children / spend / only / small part / free time / play / electronic games. ....................................................................................................................................................... 9. public library / city / have / thousands / books / and / Lan / begin / borrow books regularly. ....................................................................................................................................................... 10.video games / good fun / but players / must / careful. ....................................................................................................................................................... 11 Let/ go/ cafeteria/ and/ get/ cold drink ....................................................................................................................................................... 12 Lam/ be/ music room/ now/ and/ learn/ play/ guitar. ....................................................................................................................................................... 13 Tom/ spend/ most/ time/ lie/ couch/ front/ TV. ....................................................................................................................................................... 14 Trang/ the best/ student/ our class. ....................................................................................................................................................... 15 You/ like/ go/ movies/ me/ tonight? ....................................................................................................................................................... 16 . Minh / go swimming / every afternoon. ....................................................................................................................................................... 17 The boy / play / cards with his friends / now ? ....................................................................................................................................................... 18 She / not / meet / her father / at the moment. ....................................................................................................................................................... 19 We / help / her mother / with housework / next week. ....................................................................................................................................................... 20 You and Nam / always / watch TV ....................................................................................................................................................... 21. Minh / go swimming / every afternoon. ....................................................................................................................................................... 22. The boy / play / cards with his friends / now ? ....................................................................................................................................................... 23. She / not / meet / her father / at the moment. ....................................................................................................................................................... 24. We / help / her mother / with housework / next week. ....................................................................................................................................................... 25. You and Nam / always / watch TV .......................................................................................................................................................