Question

Результат Запиши в дециметрах и сантиметрах. 5дм-20см+48см; 70см-3дм+47см; 6см*9; 8см*9.

Answer 1

5 дм=50 см
50-20+48=78см=7,8дм

3дм=30см
70-30+47=87см=8,7дм

6*9=54см=5,4дм

8*9=72см=7,2дм

Answer 2

Conversion of Measurements

To convert the given measurements into decimeters and centimeters, we can use the following conversion factors:

1 decimeter (dm) = 10 centimeters (cm)

Now let's calculate the results:

1. 5dm - 20cm + 48cm: - First, convert 5dm to centimeters: 5dm * 10cm/dm = 50cm - Then, add the given centimeters: 50cm - 20cm + 48cm = 78cm - To convert 78cm back to decimeters and centimeters, we divide by 10: 78cm / 10 = 7dm 8cm

Therefore, the result is 7 decimeters and 8 centimeters.

2. 70cm - 3dm + 47cm: - First, convert 3dm to centimeters: 3dm * 10cm/dm = 30cm - Then, subtract the given centimeters: 70cm - 30cm + 47cm = 87cm - To convert 87cm back to decimeters and centimeters, we divide by 10: 87cm / 10 = 8dm 7cm

Therefore, the result is 8 decimeters and 7 centimeters.

3. 6cm * 9: - Multiply the given centimeters: 6cm * 9 = 54cm - To convert 54cm back to decimeters and centimeters, we divide by 10: 54cm / 10 = 5dm 4cm

Therefore, the result is 5 decimeters and 4 centimeters.

4. 8cm * 9: - Multiply the given centimeters: 8cm * 9 = 72cm - To convert 72cm back to decimeters and centimeters, we divide by 10: 72cm / 10 = 7dm 2cm

Therefore, the result is 7 decimeters and 2 centimeters.

To summarize, the results in decimeters and centimeters are as follows: 1. 5dm - 20cm + 48cm = 7dm 8cm 2. 70cm - 3dm + 47cm = 8dm 7cm 3. 6cm * 9 = 5dm 4cm 4. 8cm * 9 = 7dm 2cm

Please let me know if there's anything else I can help you with!