2.
Notam al 3-lea nr cu x
x=897500-(3534+1007)=897500-4.541=892.959
3.
a) 933+(455+148)=933+603=1536
1187+(870-230)=1187+640=1827
7500-(1250+1250)=7500-2500=5000
b) 2845-829+2400=2016+2400=4416
15780-(1075+2750)=15780-3825=11955
6204+(3000-2200)=6204+800=7000
7911 - [8211-(10100 - 5702)]=7911-[8211-4498]=
=7911-3713=4198
12563-[1456+(9
876-867)]=12563-[1456+9001]=
=12563-10457=12079
7015-[3015-(2004-4)]=7015-[3015-2000]=
=7015-1015=6000
Mult succes!