a) 1.221 + 462 ÷ 11 - 37 • 12 =
= 1.221 + 42 - 37 • 12 =
= 1.221 + 42 - 444 =
= 1.263 - 444 =
= 819
b) 25 • 25 - 500 ÷ 25 + 49 =
= 625 - 500 ÷ 25 + 49 =
= 625 - 20 + 49 =
= 605 + 49 =
= 654
c) 24 • 13 - 715 ÷ 55 + 13 =
= 312 - 715 ÷ 55 + 13 =
= 312 - 13 + 13 =
= 299 + 13 =
= 312
d) 72 • 56 ÷ 63 + 123 - 57 =
= 4.032 ÷ 63 + 123 - 57 =
= 64 + 123 - 57 =
= 187 - 57 =
= 130