Question

1.)7ч12мин-5ч45мин+19ч50мин 2).23мин-8мин15с-14мин38с спасибо

Answer 1

1.)7ч12мин-5ч45мин+19ч50мин=21ч8мин 2.)23мин-8мин15с-14мин38с=7с

Answer 2

1) To solve the first equation, let's break it down step by step:

7 hours and 12 minutes minus 5 hours and 45 minutes can be calculated as follows:

7 hours - 5 hours = 2 hours 12 minutes - 45 minutes = -33 minutes

Since we have a negative value for the minutes, we need to borrow 1 hour from the 7 hours. So, we subtract 1 hour from the 2 hours:

2 hours - 1 hour = 1 hour

Now, we add the remaining minutes to the result:

1 hour + (-33 minutes) = 1 hour - 33 minutes

Next, we add 19 hours and 50 minutes to the previous result:

1 hour - 33 minutes + 19 hours + 50 minutes can be calculated as follows:

1 hour + 19 hours = 20 hours -33 minutes + 50 minutes = 17 minutes

Therefore, the final result is 20 hours and 17 minutes.

2) Now, let's solve the second equation:

23 minutes minus 8 minutes and 15 seconds minus 14 minutes and 38 seconds can be calculated as follows:

23 minutes - 8 minutes = 15 minutes 0 seconds - 15 seconds = -15 seconds

Since we have a negative value for the seconds, we need to borrow 1 minute from the 15 minutes. So, we subtract 1 minute from the 15 minutes:

15 minutes - 1 minute = 14 minutes

Now, we add the remaining seconds to the result:

14 minutes + (-15 seconds) = 14 minutes - 15 seconds

Next, we subtract 14 minutes and 38 seconds from the previous result:

14 minutes - 15 seconds - 14 minutes - 38 seconds can be calculated as follows:

14 minutes - 14 minutes = 0 minutes -15 seconds - 38 seconds = -53 seconds

Since we have a negative value for the seconds, we need to borrow 1 minute from the 0 minutes. So, we subtract 1 minute from the 0 minutes:

0 minutes - 1 minute = -1 minute

Now, we add the remaining seconds to the result:

-1 minute + (-53 seconds) = -1 minute - 53 seconds

Therefore, the final result is -1 minute and -53 seconds.

I hope this helps! Let me know if you have any further questions.