Первое:
1)4 + 1/2 = 4 1/2 = 9/2
2)3 ÷ 9/2 = 3 × 2/9 = 2/3
3)5 - 2/3 = 15/3 - 2/3 = 13/3 = 4 1/3
второе:
1)1 - 1/3 = 3/3 - 1/3 = 2/3
2)4 ÷ 2/3 = 4 × 3/2 = 6
3)3 + 6 = 9
третье:
1)3 - 1/2 = 6/2 - 1/2 = 5/2
2)5 ÷ 5/2 = 5 × 2/5 = 2
3)6 - 2 = 4
четвёртое:
1)6 + 2/3 = 18/3 + 2/3 = 20/3
2)4 ÷ 20/3 = 4 × 3/20 = 3/5
3)2/5 + 3/5 = 5/5 = 1
