Răspuns :
84x(100x4+8)=
=84x100x4 + 84x8
=8400x4 + 336
=33600+336
=33936
sau 84x(400+8)=
=84x400 + 84x8
=33600+336
=33936 daca trebuie sa descompui neaparat in 2 numere
(2000+5)x23=
=2000x23+23x5
=46000 + 115
=46115
=84x100x4 + 84x8
=8400x4 + 336
=33600+336
=33936
sau 84x(400+8)=
=84x400 + 84x8
=33600+336
=33936 daca trebuie sa descompui neaparat in 2 numere
(2000+5)x23=
=2000x23+23x5
=46000 + 115
=46115
84×408 = 84 ×(400+8)=84×400+84×8=34272
2005×23=2005×(20+3)=2005×20+2005×3= 46115
2005×23=2005×(20+3)=2005×20+2005×3= 46115