Номер 120

1) (458 + 3042) +1757 = 3500 + 1757 = 5257;

2) (625 + 375) + 527 = 1527;

3) (9081 + 919) + 10 200 = 20 200;

4) (273 + 727) + (591 + 209) = 1000 + 800 = 1800.