1) (503+248)-364=387
2) (960-725)+209=444
3) (1000-727)+(420+180)=873
4) (350+270+105)-623=102
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Answers & Comments
1) (503+248)-364=387
2) (960-725)+209=444
3) (1000-727)+(420+180)=873
4) (350+270+105)-623=102