Câu 1: Trang 135 - Toán tiếng Anh:Calculate:Tính:a) 3 hours 12 minutes x 33 giờ 12 phút x 3 ...

a)
Cách 1:
3 hours 12 minutes x 3 = 9 hours 36 minutes
4 hours 23 minutes x 4 = 16 hours 92 minutes

92 minutes = 1 hour 32 minutes
So 3 hours 12 minutes x 3 = 17 hours 32 minutes

12 minutes 25 seconds x 5 = 62 minutes 5 seconds

Cách 2:
3 hours x 3 + 12 minutes x 3 = 9 hours + 36 minutes = 9 hours 36 minutes
4 hours x 4 + 23 minutes x 4 = 16 hours + 92 minutes = 16 hours 92 minutes

92 minutes = 1 hour 32 minutes
So 3 hours 12 minutes x 3 = 17 hours 32 minutes

12 minutes x 5 + 25 seconds x 5 = 60 minutes + 125 seconds = 62 minutes 5 seconds

b)
Cách 1:
4.1 hours x 6 = 24.6 hours
3.4 minutes x 4 = 13.6 minutes
9.5 seconds x 3 = 28.5 seconds

Cách 2:
4.1 hours x 6 = 24.6 hours
3.4 minutes x 4 = 13.6 minutes
9.5 seconds x 3 = 28.5 seconds

Vậy câu trả lời cho câu hỏi trên là:
a) 3 hours 12 minutes x 3 = 9 hours 36 minutes
b) 4.1 hours x 6 = 24.6 hours