Решите уравнения 200+×=500,353+×=920
200+×=500 x=500-200 x=300 ----------- 353+×=920 x=920-353 x=567
200 + х = 500 х = 500 - 200 х = 300 200 + 300 = 500 500 = 500 353 + х = 920 х = 920 - 353 х = 567 353 + 567 = 920 920 = 920