Viết các hỗn số sau dưới dạng phân số

a)   3 2 5

b)  - 5 2 5

c)  - 3 3 5

d)  - 2 3 7

Các số nhỏ hơn 100 là:  0;1;2;3;.....;99

Số số hạng là:   (99-0):1+1=100

Tổng là:            (99+0).100:2=4950

Trung bình cộng là: 4950:100=49,5

Mark the letter A B, C, or D to indicate the sentence that is closest in meaning to each of the following questions.

1 thought she was ill because she was absent from class yesterday.

A. She might have been ill because she didn't go to school yesterday.

B. She should have been ill because she didn't go to school yesterday.

C. She must have been ill because she didn't go to school yesterday.

D. She could have been ill because she didn't go to school yesterday,