Răspuns:
a)412+2504+382=2916+382=3298
1235+705-845=1940-845=1095
7500-(1250-1250)=7500-0=7500
b)6402-2200-3000=4202-3000=1202
2845-820+2400=2025+2400=4425
5780-(1075+2750)=5780-3825=1955
c)933+(455+148)=933+603=1536
1187+(870-230)=1187+640=1827
10000-(3019+2078)=10000-5097=4903
CU PLACERE!