Proszę o pomoc wszystko jest na zdjęciu pozdrawiam

1)  1/7 , 1/3 , 4/9 , 5/8 , 1 2/5 , 1 3/4 2)  a) 1/4 + 5/6 = 3/12 + 10/12 = 13/12 = 1 1/12 b) 4/9 - 1/6 = 8/18 - 3/18 = 5/18 c) 2/7 + 1/2 - 10/28 = 8/28 + 14/28 - 10/28 = 22/28 - 10/28 = 12/28 = 6/14 3)  4/5 * 1/2 skracamy = 2/5 * 1/1 = 2/5 b) 3/5 * 10/17 * 34/39 skracamy = 1/1 * 2/1 * 2/13 = 4/13 c) 1/2 * 3 1/3 = 1/2 * 10/3 skracamy = 1/1 * 5/3 = 5/3 = 1 2/3 d) 3 3/4 * 1 3/5 = 15/4 * 8/5 skracamy = 3/1 * 2/1 = 6/1 = 6 4)  7/8 : 4/5 = 7/8 * 5/4 = 35/32 = 1 3/32 b) 5/12 : 1/9 = 5/12 * 9/1 skracamy = 5/4 * 3/1 = 15/4 = 3 3/4 c) 2 1/2 : 3/7 = 5/2 * 7/3 = 35/6 = 5 5/6 5)  a) 4/10 - 8/15 : 2 = 4/10 - 8/15 * 1/2 skracamy = 4/10 - 4/15 * 1/1 = 4/10 - 4/15 = 12/30 - 8/30 = 4/30 = 2/15 b) 7 1/7 : 1 11/14 - 1 2/5 = 50/7 : 25/14 - 1 2/5 = 50/7 * 14/25 skracamy - 1 2/5 = 4/1 - 1 2/5 = 4 - 1 2/5 = 2 3/5 6)  a) 4/9 liczby 63 4/9 * 63 skracamy = 4/1 * 7 = 28 b) 7/15 liczby 40 7/15 * 40 skracamy = 7/3 * 8 = 56/3 = 18 2/3 c) 5 1/8 liczby 28 5 1/8 * 28 = 41/8 * 28 skracamy = 41/2 * 7 = 287/2 = 143 1/2 7)  a) 1/4 - 2/5 = 5/20 - 8/20 = - 3/20 b) - 3/16 * (-4/9) skracamy = - 1/4 * (-1/3) = 1/12 c) 1 1/2 - (-3/7) = 1 1/2 + 3/7 = 3/2 + 3/7 = 21/14 + 6/14 = 28/14 = 2 d) 5/3 : ( - 3/10) = 5/3 * (-10/3) = - 50/9 = - 5 5/9 8) 0,45 = 45/100 = 9/20 b) 0,120 = 120/1000 = 12/100 = 3/25 c) 1,6 = 1 6/10 = 1 3/5 d) 3,05 = 3 5/100 = 3 1/20 9) 2/5 = 0,4 b) 3/20 = 0,15  c) 2 12/25 = 2, 48 d) 12/16 = 0,75 10)  1 3/5 + 0,45 = 1 3/5 + 45/100 = 1 60/100 + 45/100 = 1 105/100 = 2 5/100 = 2 1/20 b) 1/2 : 0,4 = 1/2 : 4/10 = 1/2 * 10/4 skracamy = 1/1 * 5/4 = 5/4 = 1 1/4 c) 1,2 - 3/4 = 1 2/10 - 3/4 = 1 4/20 - 15/20 = 24/20 - 15/20= 9/20 d) 6/40 * 1,1 = 6/20 * 1 1/10 = 6/40 * 11/10 skracamy = 3/40 * 11/5 = 33/200 = 6 2/200 = 6 1/100 W ostatnim zadaniu nie widać całej treści. Mam nadzieję że się nigdzie nie pomyliłam. Powodzenia.