Question

(2,3\5-1,7\20)+1,1\2-7\10

Answer 1

1)2 3\5-1 7\20=(2-1)+(3\5-7\20)=1 5\20
2)1 5\20+1 1\2=(1+1)+(5\20+1\2)=2 15\20
3)2 15\20-7\10=2 1\20

Answer 2

To add the given fractions, we need to find a common denominator. Let's perform the calculations step by step:

First, we find a common denominator for the fractions: 5 and 20 have a common multiple of 20.

(2/5 - 1/20) + (1/2 - 7/10)

Next, we convert the fractions to have the common denominator of 20:

(8/20 - 1/20) + (10/20 - 14/20)

Now, we can perform the subtraction within each set of parentheses:

(8/20 - 1/20) = 7/20

(10/20 - 14/20) = -4/20

Finally, we can add the results:

7/20 + (-4/20) = 3/20

Therefore, the final result of the expression (2/5 - 1/20) + (1/2 - 7/10) is 3/20.