
(19. a) (40 м²76 дм²5 см² + 1 м² 98 см²) . 3 b) (14 км 68 м - 9 км 959 м + 320 м). 3 c) 9 см² -
81 мм² + 1 дм² 30 мм² d) 2 час 38 мин 40 сек . 2 е) 108 км/ч = ...м/мин f) 36 км/ч = ...м/с 9) 180 м/мин ...м/с h) 108 км/мин = = м/с i) 36 км/мин ... м/с

Ответы на вопрос

(40 м²76 дм²5 см² + 1 м² 98 см²)*3==(40м²+0,76м²+0,0005м²+1м²+0,098м²)*3=41,8585м²*3=125,57455м²
(14км68 м-9км959 м+320 м)*3=(14068м-9959м+320м)*3=4429*3=13287 м
9 см² - 81 мм² + 1 дм² 30 мм²=9см²-0,81см²+100см²+0,3см²=108,49 см²
2 час 38 мин 40 сек * 2=158 2/3 мин * 2 = 476 мин * 2 = 952 мин
108 км/ч = 1800 м/мин
36 км/ч = 10 м/с
180 м/мин = 3 м/с
108 км/мин = 1800 м/с
36 км/мин = 600 м/с



Let's go through each of the expressions and calculate the results step by step:
a)
To add these areas, we'll first need to convert everything to the same unit (square meters):
(since 1 дм^2 = 0.01 м^2)
(since 1 см^2 = 0.0001 м^2)
Now, add these together:
Now, multiply by 3:
b)
First, let's convert everything to meters since all the units are in meters:
(since 1 км = 1,000 м)
Now, add and subtract:
Now, multiply by 3:
c)
Let's convert everything to the same unit (square centimeters):
(since 1 мм^2 = 0.01 см^2)
(since 1 дм^2 = 100 см^2 and 1 мм^2 = 0.01 см^2)
Now, add and subtract:
d)
To convert this to seconds and then multiply by 2:
Now, add all the seconds:
Now, multiply by 2:
e)
To convert kilometers per hour to meters per minute, you can use the following conversions:
1 kilometer = 1,000 meters 1 hour = 60 minutes
So:
f)
To convert kilometers per hour to meters per second, you can use the following conversions:
1 kilometer = 1,000 meters 1 hour = 3,600 seconds
So:
To convert meters per minute to meters per second, you can use the following conversion:
1 minute = 60 seconds
So: