5.calculați: manual
1+375+299;
73+102+198;
1445+545+80;
2999+789+1001+111
12.caluculati, grupand convenabil termeni:
b) 1+2+3+....+29+30+35+500
Puisor.
2.Scoate factor comun:
a) 371 × 12 + 371 × 71 + 17 × 371 =
b) 378 × 105 + 105 × 33 - 11 × 105 =
c) 3116 × 12 + 3116 × 7 - 3116 × 9 =