Răspuns:
Ex 2 primul mod
9×(78+56) - 780=9×134-780=1206-780=426
Modul 2
1. 9 ×78=702
2.9×56=504
3. 702+504=1206
4.1206 - 780=426
Ex 3, primul mod
7×567×38=3969×38=150822 kg mere
1.7×567=3969
2.3969×38=150822
