Răspuns :
....................................................................
![Vezi imaginea Ignatovvlad201](https://ro-static.z-dn.net/files/d46/a5e4c63f006b9629716c041cbc77c4f2.png)
81-16×1953125:625:4= -12419
81-31250000:625:4= -12419
81-50000:4= -12419
81-12500= -12419
81-31250000:625:4= -12419
81-50000:4= -12419
81-12500= -12419