3/5÷ 1/6=3/5×6= 18/5 2/7÷8/2 1=2/7×2 1/8=3/4

2/9×0.375÷6/7 4÷8/3-0.6

= 2/9×375/ 1000÷6/7 =4×3/8-0.6

= 1/ 12×6/7 =3/2-0.6

=7/72 =0.9

3/4×5/6+3/4× 1/6

= 15/24+3/24

= 18/24=3/4

6.5x = 15/ 19 8/2 1x = 4/ 15 x÷4/5 = 15/28

5x÷5 = 15/ 19÷5 8/2 1x÷8/2 1 = 4/ 15÷8/2 1x÷4/5×4/5 = 15/28×4/5

x=3/ 19 x=7/ 10 x=3/7

2/3÷ 1/4 = 12

2/3x÷ 1/4× 1/4 = 12× 1/4

2/3x=3

2/3÷2/3 = 3÷2/3

x =9/2

7.6 ÷ 3/50 = 100 (hours)

8.3 minutes = 180 seconds 180 ÷ 9/ 100 = 2000 (Zhang)

9. 12 ÷ (1/2× 3) = 8 (days) or 12 ÷ 1/2 ÷ 3 = 8 (days).

10.7/1014/15 After calculation, it can be found that the final result is equal to the first number, because dividing by 2/3 and 3/4 equals multiplying by 3/2 and 4/3, and then multiplying by/kloc.