28. Calculaţi:
a) 233: (230-2²) +4 103: (2+2 102);
c) 210: (3-25+25) +120-2³-27:28;
e) (522:5¹6+27-210-3-95): (2¹7+56-3¹¹);
g) (224-4²-114)- 1321;
i) 2101.5⁹⁹ +10⁹9⁹ - 29⁹.5100,
b) 13° +(5-52-5°): 25² + 2;
d) (32:3+7¹8-7¹4): (7³2+3²³);
f) (25:23) 1¹0-25¹0 - 1020, h) (10¹0-10%): (10⁹ - 10%); j) 8¹6: (2-4¹¹)²-950: 399.

Nu sunt in ordine .​