Question

Calculati 33 x 117 + 33 x 15 + 33 x 113
201 x 327 - 201 x307 + 201 x 23
217 x 407 - 217 x 397 - 217
1725 x 707 + 324 x 707 - 321 x 707
(111+222+333+444):11 prin metoda factorului comun coroana

Answer 1

33 x 117 + 33 x 15 + 33 x 113= 33x(117+15+113)=33x245=8085

201 x 327 - 201 x307 + 201 x 23=201x(327-307+23)=201x43=8643

217 x 407 - 217 x 397 - 217=217x(407-397-1)=217x9=1953

1725 x 707 + 324 x 707 - 321 x 707= 707x(1725+324-321)=707x1728=

=1221696

(111+222+333+444):11= 111*(1+2+3+4):11=111*10 : 11=1110:11=

=100,(90)