Question

7см+ (8дм9см-8дм6см)

Answer 1

8дм9см=89см
8дм6см=86см
7+89-86=10см
10см=1дм

Answer 2

1) 1дм=10 см
2)89см-86см=3см
3)7см+3см=10см или 1дм

Answer 3

To begin with, we can simplify the expression inside the brackets by subtracting 8 decimeters 6 centimeters from 8 decimeters 9 centimeters, which gives us 3 centimeters.

Therefore, the expression simplifies to:

7 cm + (8 dm 9 cm - 8 dm 6 cm) = 7 cm + 3 cm

Now, we can add 7 centimeters and 3 centimeters to get the final answer:

7 cm + 3 cm = 10 cm

So, the final answer is 10 centimeters.