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Estimeaza rezultatele prin rotunjire la ordinul miilor apoi verifica calculu:3472+2126= ,1423+6272= ,5126+3452=, 3003+5001= ,7126+1430+1303= , 1304+5021+2564= , 1001+1001+1001= , 6021+2342+1523=

Răspuns :

3472+2126= 34000+2000+126+472=36000+598=36 598
1423+6272=1000+600+423+272=7000+695=7 695
5126+3452=5000+3000+126+452=8 578
3003+5001=3000+5000+4=8 004
7126+1430+1303= 7000+1000+1000+126+430+303=9000+859=9 859 1304+5021+2564=1000+5000+2000+304+21+564=8000+889=8 809
1001+1001+1001=3000+3=3 003
6021+2342+1523=6000+2000+1000+21+342+523=9000+886= 9 886