Răspuns:
a) Modul I : Modul al doilea: 75x42+75x120=
75x42+75x120= 75x (42+120)=
3150+9000= 75x 162=
12.150 12.150
b) Modul I : Modul al doilea : 81x (148-59)=
81x (148-59)= 81x148-81x59=
81x 89= 11.988-4.779=
7.209 7.209
c) Modul I : Modul al doilea : 114x(123+35)=
114x(123+35)= 114x123+114x35=
114x 158= 14.022+3990=
18.012 18.012
d) Modul I : Modul al doilea : 342x6-4x342=
342x6-4x342= 342x (6-4)=
2052- 1368= 342x2=
684 684
