560 + 906 * 2 = 2372
560 + 906 * 3 = 3278
560 + 906 * 5 = 5090
560 + 906 * 10 = 9620
560 + 906 * 45 = 41330
5/6:2/3=1 1/4-1.25 11/3:2=1 5/6 1 5/6:2/9=8 1/4-8.25
B=10 50:10=5 20:10=2 80:10=8
1. а)208*760≈210*760=159600
б)7900*5609≈7900*5610=44319000
2.а)4932000:8≈4930000:8=616250
б)256140:60≈300000:60=50000