Réponse :
Explications étape par étape :
Addition of Time Durations:
To add time durations, we need to perform addition with the hours and minutes separately.
3-20:10 + 3:10:
To add 3 hours and 20 minutes to 3 hours and 10 minutes, we add the hours and minutes separately.
Hours: 3 + 3 = 6 hours.
Minutes: 20 + 10 = 30 minutes.
Therefore, the sum is 6 hours and 30 minutes.
3:5 - 4:15 + 7:30:
To subtract 4 hours and 15 minutes from 3 hours and 5 minutes and then add 7 hours and 30 minutes, we perform the operations separately.
Subtracting 4 hours and 15 minutes from 3 hours and 5 minutes:
Hours: 3 - 4 = -1 hour (carry over to minutes).
Minutes: 5 - 15 = -10 minutes.
Therefore, the result is -1 hour and -10 minutes.
Adding 7 hours and 30 minutes to the previous result:
Hours: -1 + 7 = 6 hours.
Minutes: -10 + 30 = 20 minutes.
Therefore, the final sum is 6 hours and 20 minutes.
1+3:10:
To add 1 hour to 3 hours and 10 minutes, we add the hours and minutes separately.
Hours: 1 + 3 = 4 hours.
Minutes: 0 + 10 = 10 minutes.
Therefore, the sum is 4 hours and 10 minutes.
2 + 15:8:
To add 2 hours to 15 hours and 8 minutes, we add the hours and minutes separately.
Hours: 2 + 15 = 17 hours.
Minutes: 0 + 8 = 8 minutes.
Therefore, the sum is 17 hours and 8 minutes.
1- (2:10+7:10):
To subtract the sum of 2 hours and 10 minutes and 7 hours and 10 minutes from 1 hour, we perform the operations separately.
Adding 2 hours and 10 minutes to 7 hours and 10 minutes:
Hours: 2 + 7 = 9 hours.
Minutes: 10 + 10 = 20 minutes.
Therefore, the sum is 9 hours and 20 minutes.
Subtracting 9 hours and 20 minutes from 1 hour:
Hours: 1 - 9 = -8 hours (carry over to minutes).
Minutes: 0 - 20 = -20 minutes.
Therefore, the result is -8 hours and -20 minutes.
