Răspuns :

807-105=702, prin in proba inversa 702+105=807, 752-141=611, prin proba inversa 611+141=752, 244+442=686, prin proba inversa 686-442=244, 776-520=256, prin proba inversa 256+520=776, 610+240=850, prin proba inversa 850-240=610. Sper ca ai inteles! Bafta in continuare!