Question

3м2 9 дм2 – дм2 6 дм2 20 cм2 = см2 2 м2 = см2 9 дм2=мм2​

Answer 1

Ответ:

3м² 9дм² = 309дм² 6дм² 20 см² = 620см² 2м² = 20000см² 9дм² = 90000мм .

Answer 2

To solve the given expressions, let's convert the units to a common base unit, which is the square centimeter (cm²).

1. To subtract different units, we need to convert them to the same unit.

3m² = 300 cm × 300 cm = 90000 cm² 9 dm² = 90 cm × 90 cm = 8100 cm² 1 dm² = 10 cm × 10 cm = 100 cm² 6 dm² = 60 cm × 60 cm = 3600 cm² 20 cm² = 20 cm × 20 cm = 400 cm²

Now, let's subtract the areas: 90000 cm² - 8100 cm² - 100 cm² - 3600 cm² - 400 cm² = 78100 cm²

Therefore, 3m² 9 dm² – 1 dm² 6 dm² 20 cm² = 78100 cm².

2. To convert 2 m² to cm²: 2 m² = 200 cm × 200 cm = 40000 cm²

Therefore, 2 m² = 40000 cm².

3. To convert 9 dm² to mm²: 1 dm = 10 cm 9 dm² = (9 × 10 cm) × (9 × 10 cm) = 900 cm × 900 cm = 810000 cm² 1 cm² = 10 mm × 10 mm = 100 mm²

Now, let's convert cm² to mm²: 810000 cm² × 100 mm²/cm² = 81000000 mm²

Therefore, 9 dm² = 81000000 mm².