Question

7м89см-9см= 7м8дм9см-8дм= 789см-7м

Answer 1

Ответ:

1)780 2)781 3)89 ...........

Answer 2

Let's perform the calculations step by step:

1. 7м89см - 9см: To subtract centimeters, we must ensure that both measurements are in the same unit. 9cm can be expressed as 0м9см.

7м89см - 0м9см = 7м80см.

2. 7м8дм9см - 8дм: First, we need to convert 8дм to centimeters. Since 1 дм (decimeter) is equal to 10 cm, 8 дм is equal to 8 * 10 = 80 cm.

7м8дм9см - 8дм (or 80 cm) = 7м8дм(9см - 80cm).

Now, let's subtract the centimeters: 9см - 80cm = -71см.

Therefore, 7м8дм(9см - 80cm) = 7м8дм(-71см).

3. 789см - 7м: To subtract meters from centimeters, we must convert 7 meters to centimeters. Since 1 meter is equal to 100 centimeters, 7 meters is equal to 7 * 100 = 700 centimeters.

789см - 700см = 89см.

So, the final results are:

1. 7м89см - 9см = 7м80см.
2. 7м8дм9см - 8дм = 7м8дм(-71см).
3. 789см - 7м = 89см.