Răspuns:
2.a)428+128:4=428+32=460
(428+128):4=556:4 = 139
b)4845-963:3= 4845- 321= 4524
(4845-963):3= 3882:3=1294
c)64+36:36+64=64+1+64=129
(64+36):(36+64)= 100:100=1
3.a)(420:42)-(40:5)= 10-8=2
b) (218-68): 2×0=150:2×0=75×0=0
c)200-(100:100)-100=200-1-100=199-100=99