(1 1/4 * 2/5 + 3 3/7 : 9/14) : 5/12 - 10 1/5 = 3 4/5
1) 1 1/4 * 2/5 = 5/4 * 2/5 = 2/4 = 1/2
2) 3 3/7 : 9/14 = 24/7 * 14/9 = (8*2)/(1*3) = 16/3 = 5 1/3
3) 1/2 + 5 1/3 = 3/6 + 5 2/6 = 5 5/6
4) 5 5/6 : 5/12 = 35/6 * 12/5 = (7*2)/(1*1) = 14
5) 14 - 10 1/5 = 13 5/5 - 10 1/5 = 3 4/5
Пояснения:
1 целая 1/4 = (1*4+1)/4 = 5/4
3 целых 3/7 = (3*7+3)/7 = 24/7
1/2 = 3/6 - доп.множ. 3
1/3 = 2/6 - доп.множ. 2
5 целых 5/6 = (5*6+5)/6 = 35/6
14 = 13 + 5/5 = 13 целых 5/5