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cho em hỏi đoạn văn này ở đâu vậy ạ em muốn cop nhưng em tìm không ra . Mn giúp em với ạ 

1:

a: Các cặp góc đối đỉnh là: \(\widehat{aOb}';\widehat{a'Ob}\); \(\widehat{aOb};\widehat{a'Ob'}\)

b: Các cặp góc kề bù là: \(\widehat{aOb};\widehat{aOb'}\); \(\widehat{aOb'};\widehat{b'Oa'}\); \(\widehat{b'Oa'};\widehat{bOa'}\); \(\widehat{aOb};\widehat{a'Ob}\)

2:

Oz là phân giác của góc xOy

=>\(\widehat{xOz}=\dfrac{\widehat{xOy}}{2}=\dfrac{142^0}{2}=71^0\)

Ta có: \(\widehat{xOz}+\widehat{x'Oz}=180^0\)(hai góc kề bù)

=>\(\widehat{x'Oz}=180^0-71^0=109^0\)

30 C

31 A

32 C

33 A

34 A

35 C

36 D

37 C

38 C

39 D

40 A

41 A

42 C

43 A

44 B

b.to nha bạn

b.to

The teacher will have the article read by the students

The teacher will let the students read the article.

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Nowadays, viruses becoming more popular everywhere is easy to spread. To prevent viruses, there are some useful ways. The most effective way is to do exercise every day. It also costs a little bit, but for your safety. Next, you should wear masks when being in a crowded place. You can find masks in any drug stores near you. Last but not least, washing your hands often can help you a lot, especially before eating.