Giải vở bài tập Toán Hình học 7 chương II: Ôn tập học kì I (tiết thứ nhất)
Hướng dẫn Giải vở bài tập Toán Hình học 7 chương II: Ôn tập học kì I (tiết thứ nhất)
Bài 1:
- Câu a và câu b đúng.
- Câu c sai (vì 2 đường thẳng không cắt nhau thì có thể trùng nhau hoặc song song).
- Câu d sai (vì hai góc trong cùng phía có thể bằng nhau nhưng hai đường thẳng a, b có thể không song song).
Bài 2:
Bài 3:
Ta có x +
1= 180o (hai góc kề bù)
Nên x = 180o -
1= 180o – 100o = 80o
Hoặc x =
1 (Hai góc đồng vị). Mà 
1 = 80o, nên x = 80o
- Câu a và câu b đúng.
- Câu c sai (vì 2 đường thẳng không cắt nhau thì có thể trùng nhau hoặc song song).
- Câu d sai (vì hai góc trong cùng phía có thể bằng nhau nhưng hai đường thẳng a, b có thể không song song).
Bài 2:
Bài 3:
Ta có x +
1= 180o (hai góc kề bù)Nên x = 180o -
1= 180o – 100o = 80oHoặc x =
1 (Hai góc đồng vị). Mà 1 = 80o, nên x = 80o
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