Va rog repede, NU STIU LA A DOUA METODA, dau coroana!

Răspuns:
a doua metoda
(58x45)+(58x26)=2610+1508=4118
(78x25)-(39x25)=1950-975=975
(75x40)+(15x40)=3000+600=3600
(72x100)-(72x55)=7200-3960=3240