Question

Calculați făcând proba:
325+139=
726-457=
5278-1029=
8923-5375=
(765-392)+(128+296)=
(449+878)+(9237-6495)=
213+459-370=
858-576+309=
1085-(723+95)=
3406+5275-2903=
(3509-1879)+875-298)=
(7306+1398)-(2099+1005)=

Answer 1

325+139=464      proba: 464-139=325

726-457=269      proba: 269+457=726

5278-1029=4249      proba: 4249+1029=5278

8923-5375=3548      proba: 3548+5375=8923

(765-392)+(128+296)=373+424=797     proba: 797-424=373

(449+878)+(9237-6495)=1327+2742=4069    proba: 4069-1327=2742

213+459-370=672-370=302      proba: 302+370=672

858-576+309=282+309=591     proba: 591-309=282

1085-(723+95)=1085-818=267    proba: 267+818=1085

3406+5275-2903=8681-2903=5778     proba: 5778+2903=8681

(3509-1879)+(875-298)=1630+577=2207      proba: 2207-577=1630

(7306+1398)-(2099+1005)=8704-3104=5600     proba: 5600+3104=8704