Срочно помогите решить умножение и разделение дробей

Умножение:

1) 1/5 x 2/3 = 2/15

2) 2/3 x 1/4 =1/6

3) 3/10 x 5/9 = 6

4) 2/5 x 2 = 4/5 = 0,8

5) 3 2/9 = 2/3

6) 3/4 3 = 9/4 = 8 1/4 = 8,25

7) 2/7 14 = 4

Деление:

1) 1/7 : 2/3 = 1/7 x 3/2 = 3/14

2) 1/3 : 2/3 = 1/3 3/2 = 1/2 = 0,5

3) 3/7 : 3/7 = 1

4) 2/5 : 8/15 = 2/5 x 15/8 = 3/3 = 1

5) 2/3 : 3/5 = 2/3 x 5/3 = 10/9 = 1 1/9

6) 2/15 : 4 = 2/15 x 1/4 = 1/30

7) 2/5 : 6 = 2/5 x 1/6 =1/15

8) 3 : 5/6 = 3 6/5 = 18/5 = 3 3/5 = 3,6

9) 10 : 1/7 = 10 x 7 = 70