Tác giả bài văn lão hạc và quê quán của ông

Cho $x^{2}$ + $y^{2}$ + $z^{2}$-xy-yz-zx =0 CMR: x=y=z

Mn giải giúp em với🥺 sáng mai em phải nộp bài rồi

help meeee! làm gấp giúp mik nhé

Đâu là đơn chất đâu là hợp chất O3,NaCl,P

Use expressions to describe these situations. 29. We both thought the other was going to pick up Roger. There was a _____. 30. The kids have been unhappy since their parents divorced. They come from a _____. 31. Her marriage has been both good and bad at different times. It has _____. 32. The two union leaders have had a serious disagreement which has split them. A serious _____. 33. Two of the brothers have not spoken to their other brother for twenty years because of something bad that happened. I think it’s a _____.

Rewrite these sentences to give the opposite meaning. 26. Rick and his sister shared the same opinion on a lot of things. 27. Her affection for Andrew has grown stronger lately. I expect they’ll get engaged. 28. Our relationship stayed firm because we always understood each other.

Some words in these sentences have been used incorrectly. Rewrite the sentences using the correct word 16. We both own the company: we’re bitter rivals. 17. I’ve made several casual colleagues since moving to London, but no close friends yet. 18. Were Britain and the USA colleagues in the First World War too? 19. The two companies hate each other: they’re acquaintances.

Tính khối lượng bằng gam của 5 phần tử Fe2O3

Đăng giờ này ko biết có ai thức ko ạ (´Д｀)