a) 1375 + 96 - 100 + 849 =
= 1471 - 100 + 849 =
= 1371 + 849 =
= 2220
b) 55 : 5 x 3 x 2 : 2 = 11 x 3 x 2 : 2 = 33 x 2 : 2 = 66 : 2 = 33
c) 80 : 2 + (50 x 2 : 10 + 90) + 10 - 25 x 4 =
= 40 + (100 : 10 + 90) + 10 - 100 =
= 40 + (10 + 90) + 10 - 100 =
= 40 + 100 + 10 - 100 =
= 140 + 10 - 100 =
= 150 - 100
= 50