Odpowiedź:
Szczegółowe wyjaśnienie:
1 1/5 + (1,2 * 7/12 - 0,9) = 6/5 + (6/5 * 7/12 - 9/10) = 6/5 + 42/60 - 9/10 =
= 12/10 + 7/10 - 9/10 = 10/10 = 1
1 3/10 - 0,1 : 1 1/5 = 13/10 - 1/10 : 6/5 = 13/10 - 1/10 *5/6 = 13/10 - 5/60 =
= 78/60 - 5/60 = 73/60 = 1 13/60
1 1/3 + 2/3 : 0,2 = 4/3 + 2/3 : 1/5 = 4/3 + 2/3 * 5 = 4/3 + 10/3 = 14/3 = 4 2/3
4,2 : 3/5 - 3 1/3 * 0,3 = 21/5 * 5/3 - 10/3 * 3/10 = 7 - 1 = 6
(4,6 - 2 1/3) : (-1) = (23/5 -7/3) * (-1) = (69/15 - 35/15) * (-1) = - 34/15 = - 2 4/15