№128/35 = 4/58/12 = 2/339/9170/112 = 35/56 = 5/840/72 = 5/9
№24/7 + 5/6 = (24 + 35) / 42 = 59/429/20 - 5/12 = (54 - 50) / 240 = 4/240 = 1/605/42 + 9/28 = (20 + 27) / 84 = 47/84
9/20 - 7/24 + 3/10 = (216 - 140 + 72) / 480 = 148/480 = 37/120
№3x + 1/12 = 1/3 + 1/4x + 1/12 = 4/12 + 3/12x + 1/12 = 7/12x = 6/12x = 1/2
№41/4 + 1/8 = 2/8 + 1/8 = 3/8
№51/6 < 1/47/8 > 7/8
№1
28/35 = 4/5
8/12 = 2/3
39/91
70/112 = 35/56 = 5/8
40/72 = 5/9
№2
4/7 + 5/6 = (24 + 35) / 42 = 59/42
9/20 - 5/12 = (54 - 50) / 240 = 4/240 = 1/60
5/42 + 9/28 = (20 + 27) / 84 = 47/84
9/20 - 7/24 + 3/10 = (216 - 140 + 72) / 480 = 148/480 = 37/120
№3
x + 1/12 = 1/3 + 1/4
x + 1/12 = 4/12 + 3/12
x + 1/12 = 7/12
x = 6/12
x = 1/2
№4
1/4 + 1/8 = 2/8 + 1/8 = 3/8
№5
1/6 < 1/4
7/8 > 7/8