Пошаговое объяснение:
45 : 5/7 = 45 * 7/5 = 9 * 7/1 = 63/1 = 63
30 : 5/9 = 30 * 9/5 = 6 * 9/1 = 54/1 = 54
16 : 4/5 = 16 * 5/4 = 4 * 5/1 = 20/1 = 20
а) 45÷5/7= 45/1×7/5= 9/1×7/1=63/1=63
б) 30÷5/9=30/1×9/5= 6/1×9/1=54/1=54
в) 16÷4/5= 16/1×5/4= 4/1×5/1=20/1=20
