Question

45дм21мм+39дм7см= (4класс)

Answer 1

Ответ:

84 дм 7 см 21 мм

Пошаговое объяснение:

в 1 дм 10 см, в 1 см 10 мм, тогда 450,21 см +397 см = 847, 21 см

Answer 2

To add these two measurements, you need to ensure they are in the same units. Let's convert everything to centimeters (cm) first, as it's a commonly used unit for adding measurements.

1 decimeter (dm) = 10 centimeters (cm) 1 meter (m) = 100 centimeters (cm)

So, we have: 45 dm = 45 * 10 cm = 450 cm 21 mm = 21 * 0.1 cm = 2.1 cm (converted millimeters to centimeters) 39 dm = 39 * 10 cm = 390 cm 7 cm = 7 cm (already in centimeters)

Now, we can add them up: 450 cm + 2.1 cm + 390 cm + 7 cm = 849.1 cm

Therefore, 45 dm 21 mm + 39 dm 7 cm = 849.1 cm.