найдите значения выражений 7/20 -(9/35) 5/6+5/18-(3 7/9- 213/15) (21/22-5/11)-(22/39-3/13) 4(41/84-5/21)+7 11/30

а) 7/20 - 9/35 = 49/140 - 36/140 = 13/140;Ответ: 13/140.б) 1) 3 7/9 - 2 13/15 =3 35/45 - 2 39/45 = 2 80/45 - 2 39/45 = 41/45;2) 5/6 + 5/18 =15/18 + 5/18 = 20/18 = 1 2/18 = 1 1/9;3) 1 1/9 - 41/45 =1 5/45 - 41/45 = 50/45 - 41/45 = 9/45 = 1/5.Ответ: 1/5.в) 1) 21/22 - 5/11 =21/22 - 10/22 =11/22 =1/2;2) 22/39 - 3/13 =22/39 - 9/39 = 13/39 = 1/3;3) 1/2 - 1/3 =3/6 - 2/6 =1/6.Ответ: 1/6.г) 1) 41/84 - 5/21 =41/84 - 20/84 = 21/84 = 1/4;2) 1/4 + 7 11/30 =15/60 + 7 22/60 = 7 37/60.Ответ: 7 37/60.