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Calculati cat mai rapid:
3456+1358-1358=
10000-3478+3478=
5432+3432-5432=
7300-7300+7300=
2732+5789-2732=
9090-4507+4507=


Răspuns :

3456+1358-1358=3456
10000-3478+3478=10000
5432+3432-5432=3432
7300-7300+7300=7300
2732+5789-2732=5789
9090-4507+4507=9090.