1. Zadatak

Prvi način:

$$698\cdot134-260:2\cdot698+(13\cdot49+7\cdot9)-456:228=$$ $$=698\cdot134-130\cdot698+(637+63)-2=$$ $$=698\cdot(134-130)+700-2=$$ $$=698\cdot4+698=$$ $$=698\cdot(4+1)=698\cdot5=$$ $$=3\,490$$

Drugi način:

$$698\cdot134-260:2\cdot698+(13\cdot49+7\cdot9)-456:228=$$ $$=698\cdot134-130\cdot698+(637+63)-2=$$ $$=93\,532-90\,740+700-2$$ $$=2\,792+700-2$$ $$=3\,492-2$$ $$=3\,490$$