Question

Вычислите удобным способом:1) (36*21):12=2) (40*420):60=3) (5*6*78):3=4) (45*63):81=

Answer 1

1) (36*21)/12=3*21=63
2) (40*420)/60=40*7=280
3) (5*6*78)/3=5*2*78=10*78=780
4) (45*63)/81=(45/9*63/9)=5*7=35