Câu 1:
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Cau-1-1.png)
Câu 2:
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Cau-1-2.png)
Câu 3:
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Cau-1-3.png)
Câu 4:
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Cau-1-4.png)
Câu 5:
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Cau-1-5.png)
Đáp án:
Câu 1: Ta có
100 + 100 x 0 - 100
= 100 + 0 - 100
= 0
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Dap-An-1.png)
Câu 2:
50 + 10 : 2 - 200
= 50 + 5 - 200
= -145
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/DapAn-2.png)
Câu 3:
10 + 5 + 9 : 3 x (2 + 3)
= 10 + 5 + 3 x 5
= 10 + 5 + 15
= 30
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Dap-An-3.png)
Câu 4:
12 x 2 + 18 : 6 + 20
= 24 + 3 + 20
= 47
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Dap-An-4.png)
Câu 5:
15 - 5 + 5 x (3 + 2)
= 15 - 5 + 5 x 5
= 15 - 5 + 25
= 35
![](https://media-cdn-v2.laodong.vn/Storage/NewsPortal/2021/3/18/890292/Dap-An-5.png)