Решим примеры:
* $$780 : 6 = 130$$
* $$570 : 3 = 190$$
* $$910 : 7 = 130$$
* $$6 \cdot 130 = 780$$
* $$4 \cdot 240 = 960$$
* $$3 \cdot 170 = 510$$
* $$840 : 2 + 580 = 420 + 580 = 1000$$
* $$650 : 5 + 170 = 130 + 170 = 300$$
* $$880 : 4 - 200 = 220 - 200 = 20$$