Помогите с дробями пожалуйста !))

10 : 2/5 - 3/10 =

(1,1/2 - 3/8) : 3 =

3/4 : (1 - 1/4 + 3/8) =

(1/3 + 1/4) : (2 - 5/6) =

1 1/2-3/8):3=1 1/2-3/8=3/2-3/8=12/8- 3/8=4/8:3/1=4/8×1/3=4/24=1/6

10/2/5-3/10=2/5-3/10=4/10-3/10=1/10:10/1=1/10×1/10=1/100. (1 1/2-3/8):3=1 1/2-3/8=3/2-3/8=12/8- 3/8=4/8:3/1=4/8×3/1=4/24=1/6. (1/3+1/4):(2-5/6)=1/3+1/4=4/12+3/12=7/12; 2-5/6=2/1-5/6=12/6-5/6=7/6; 7/12:7/6=7/12×6/7=42/84=1/2=0,5.