ua neu cau sai thi danh rong

1.Is a Dog under table. Yes,It Is

2.Are there books on the bookshelf. Yes, there are

3.Are there flowers the garden. No,there aren't

4.Is a refrigerator near the kitchen table. No,it isn't

5.Are there armchairs in front of the television. Yes,there are

6.Is a ball on the floor. Yes,it is

7.Are there stools in the living room. No,ther aren't

8.Is a tub in the bathroom. No,it isn't

Roi cai nay phai thuc hanh may tinh moi biet dc

a) -6 > -8                      b) -9 < 0

c) 15> -16                    d) -(-7) > -7

làm tăng năng suât cây trông và chât luong nong san