-5/8• 32/10m+ 5/8• (5•1+3)/5n + 72/10• 4/9m - 18n= 1/1• 4/2m + 5/8• 8/5n+ 8/5• 2/1m -18n= {5 и 10 Сократили на 5; 8 и 32 на 8; 72 и 9 на 9; 10 и 4 на 2} 2m + 1/1• 1/1n + 16/5m- 18n= {4/2 сократили на 2; 5 и 5 на 5; 8 и 8 на 8} 2m+ n + 3 1/5m -18n= 5 1/5m - 17n;
(5 3/10 - 3 4/5 * 13/38) * 5/84 + 2 1/12 * 4/15 = 50/63
1) 3 4/5 * 13/38 = 19/5 * 13/38= 1/5 * 13/2 = 13/10
2) 5 3/10 - 13/10 = 53/10 - 13/10 = 40/10 = 4
3) 4 * 5/84 = 20/84 = 5/21
4) 2 1/12 * 4/15 = 25/12 * 4/15 = 5/3 * 1/3 = 5/9
5) 5/21³ + 5/ 9 ⁷ = 15/63 + 35/63 = 50/63