помогите решить пож я уже не могу

А)
1)72/11 * 3/4 = 54/11
2) 54/11 : 12/5 = 54/11 * 5/12 = 45/22
3) 45/22 * 11/5 = 9/2 = 4,5

б) 
1) 28/3 : 7/8 = 28/3 * 8/7 = 32/3
2) 32/3 * 7/16 = 14/3
3) 14/3 : 14/27 = 14/3 * 27/14 = 9

в)
1) 5/4 - 5/14 = 35/28 - 10/28 = 25/28
2) 25/28 : 25/144 = 25/28 * 144/25 = 36/7
3) 5/14 + 18/35 + 36/7 = (25 + 36 + 360)/70 = 421/70 = 6 1/70

г) 
1) 7/12 - 8/15 = (35 - 32)/60 = 3/60 = 1/20 = 0,05
2) 7/10 - 9/16 = (56 - 45)/80 = 11/80
3) 4/5 * 11/80 = 11/100 = 0,11
4) 0,0025 + 0,11 = 0,1125

А)
6 6/11 * 3/4 : 2 2/5 * 2 1/5 = 72/11 * 3/4 : 12/5 * 11/5 =
= 72/11 * 3/4 * 5/12 * 11/5 = 18/4 = 9/2 = 4 1/2,

б) 9 1/3 : 7/8 * 7/16 : 14/27 = 28/3 * 8/7 * 7/16 * 27/14 = 18/2 = 9,

в)
5/14 + 18/35 + (1 1/4 - 5/14) : (5/12) = 6 1/70,

1) 1 1/4 - 5/14 = 5/4 - 5/14 = 35/28 - 10/28 = 25/28,
2) (5/12) = 25/144,
3) 25/28 : 25/144 = 25/28 * 144/25 = 144/28 = 36/7 = 5 1/7,
4)  5/14 + 18/35 + 5 1/7 = 25/70 + 36/70 + 5 10/70 = 5 71/70 = 6 1/70,

г)
(7/12 - 8/15) + 4/5 * (7/10 - 9/16) = 9/80,

1) 7/12 - 8/15 = 35/60 - 32/60 = 3/60 = 1/20,
2) (1/20) = 1/400,
3) 7/10 - 9/16 = 56/80 - 45/80 = 11/80,
4) 4/5 * 11/80 = 11/100,
5) 1/400 + 11/100 = 1/400 + 44/400 = 45/400 = 9/80