1 = 300
2 = 100
3 = 214
Пошаговое объяснение:
1 680-8 x 50 + 20 = 680-400+20 = 300
2 350 : 7 + 200 :4 = 50+50 = 100
3 (6+134) : 10 +200 = 140:10+200 = 14+200 = 214
