Răspuns:
a.
126 + 127 + 128 + 2124 + 2123 + 2122 =
(126 +2124) + (127 + 2123) + ( 128 + 2122) =
2250 + 2250 + 2250 =
4500 + 2250 =
6750
b.
11.307 + 11.308 + 11.309 + 21 + 22 + 23 =
(11307 + 23) + (11308 + 22 ) + (11309 + 21) =
11330 + 11330 + 11330 =
22660 + 11330 =
33990