1) 8/10 + 3/7 = (56+ 30) / 70 = 86/70 = 43/35 = 1цел.8/35
2) 10/3 - 25/10 = 10/3 - 5/2 = (20 - 15) /6 = 5/6
3) 49/10 + 10/9 = (441 + 100) / 90 = 541 / 90 = 6цел.1/90
4) 261/ 11 - 57/10 = (2610 - 627) /110 = 1983/ 110 = 18цел.3/110
5) 40цел.8/10 + 15цел.2/3 = 55цел + (24 +20)/ 30 = 55цел + 44 /30 = 56цел.14/30=
= 56цел.7/15
6) 18цел.5/13 - 9цел.5/10 = 8цел + (18/13 - 5/10) = 8цел. + (180 - 65)/130 =
= 8цел.115 / 130 = 8цел.23/26