(1,05 + (-11/20)) + 9/11=1 7/22
1) 1,05 + (-11/20) = 105/100 + (-55/100) = 50/100 = 1/2
2) 1/2 + 9/11 = 11/22 + 18/22 = 29/22 = 1 7/22
(1,05 + (-11/20)) + 9/11=1 7/22
1) 1,05 + (-11/20) = 105/100 + (-55/100) = 50/100 = 1/2
2) 1/2 + 9/11 = 11/22 + 18/22 = 29/22 = 1 7/22