Tính nhanh tổng sau 1+2+3+4........+49+50

Làm hộ mình bài 7 mai mình nộp rồi

C.Mác nghiên cứu nội dung và quy luật kinh tế của phương thức sản xuất nào?

Cho A là H2SO4 0,5 M B là NaOH 0,5 trộn A B theo tỉ lệ nào để pH = 2, pH = 13

Giúp mình bài này vớiạ Cần gấp

Kinh tế chính trị Mác – Lênin là một môn khoa học nên nó có đặc điểm gì?

Chủ nghĩa trọng nông xuất hiện từ thế kỷ thứ mấy?

xét chiều biến thiên y= căn 2x^2 + 1

Complete the sentences with the correct word(s). Example: She tried on the dress in the shop. off on up 1 Have you __________ your bed this morning? done made cleaned 2 They don’t go __________ to eat very often. off out up 3 The hotels are too expensive, so we’re __________ at a campsite. staying hiring renting 4 How do you __________ this word? repeat underline pronounce 5 We’re seeing our cousins next week. We’re really looking __________ it. for forward to after 6 The town centre was very __________. There were a lot of people. quiet boring crowded 7 My university course starts __________ October. in on at 8 We __________ at the hotel very late last night. got arrived came 9 I __________ Victor some money last month, and he hasn’t paid me back. spent lent borrowed 10 Don’t eat all that cake! It’s really __________. unhealthy uncomfortable polluted 11 What did you think __________ the play? off for of 12 This lesson started __________ 9.15. You’re late again! on in at 13 I’m going to _______ Chris to our picnic this weekend. meet invite stay 14 Don’t worry _______ the washing up. I’ll do it later. about for on 15 Who’s paying _______ the car parking? to for on

giúp mik b3 vs cảm ơn nhiều nha