Khử 12 gam đồng (II) oxit bằng khí hiđro ở nhiệt độ cao. Thể tích khí hiđro (ở đktc) cần dùng là *

ai lm jup e vs em sắp nộp r huhu

Qua bốn bài ca dao nói về quê hương, em có cảm nhận gì về tình cảm của tác giả dân gian?

tìm n thuộc Z để 2n+5 chia hết cho n+1

For questions 41–55, read the text below and look carefully at each line. Some of the lines are correct, and some have a word which should not be there. If a line is correct, put a tick (✓) at the end of the line. If a line has a word which should not be there, write the word. There are two examples at the beginning (0 and 00). 0 A colleague at work had a small boat in which every weekend ✓ 00 he used to go for sailing. He invited myself and a friend to go for 41 with him on a sailing trip. We imagined that ourselves sitting on ________ 42 the deck of the boat, near a beach, sunbathing and doing what we ________ 43 wanted. But the reality was much more different. Our friend, who ________ 44 owned it the boat, wanted to do some real sailing and was only ________ 45 happy with at sea. As a result, we were actually at sea most ________ 46 of the time. To make matters the worse our friend spent a lot ________ 47 of the time shouting orders at us. Whatever was the weather ________ 48 we sailed on and on. We did get a tan but not from the sun, ________ 49 it was from the strong winds in which blew cold sea water ________ 50 in our faces all day. We had been imagined a relaxing time ________ 51 doing for nothing but it was not the case. Unfortunately, when ________ 52 we got back to home our friends were very envious and ________ 53 would not believe that we had had such a demanding time. ________ 54 We were considered to be very lucky people indeed and ________ 55 they could not understand why we were complaining about. ________

Giải giúp mik đi các thiên thần Mik cần gấp lắm đó các thiên thần của tui

Các máy cơ đơn giản A: lợi cả về lực và đường đi B: chỉ có lợi về lực. C: luôn bị thiệt về đường đi D: không cho lợi về công

Bài 3 : Trên cùng một nửa mặt phẳng có bờ chứa tia Ox vẽ hai tia Oz và Ot sao cho xOz =110 độ , xOt =55 độ . a.Tính số đo tOz b.Gọi Oy là tia đối của tia Ox.Tính số đo góc kề bù với xOz

mọi người giúp mình bài toán này với

Hãy viết 5 và 5/9 thành hai phân số đều có mẫu số là 9 ; là 18.