Вычислите устно
520+80=. 250•3= 960:3=
970-160=. 400•5= 960:30=
1000-900=. 14•7= 1500:500=
630+400=. 90•30= 4800:2=
Решите пж
:) :) :) :)

520+80=600970-160=8101000-900=100630+400=1030250×3=750400×5=200014*7=9890×30=2700960:3=320960:30=321500:500=34800:2=2400

520+80=600250*3=750960/3=320970-160=810400*5=2000960/30=321000-900=10014*7=981500/500=3630+400=103090*30=27004800/2=2400