Помогите решить примеры:
заранее спасибо огромное)*

а)    1 9/10 + 3 1/10 =  4 10/10 = 5

б)    4 3/5 + 2 4/5 = 6  7/5 = 7 2/5

в)   6 - 3/5 = 5 5/5 - 3/5 = 5 2/5

г)    2 -1 4/9 = 1 9/9 - 1 4/9 = 5/9

д)   15 7/20 - 3 8/20 = 12 7/20 - 8/20 = 11 (20/20 +7/20) -8/20 =11 27/20 -8/20 =             =11 19/20

е) 2 7/16 + 8/9 + 9/16 +1/9 = 2 + (63+128+81+16)/144 = 2+ 288/144 = 2+2 = 4

а) 1 9/10 + 3 1/10 =  4 10/10 = 5;
б) 4 3/5 + 2 4/5 = 6  7/5 = 7 2/5;
в) 6 - 3/5 = 5 5/5 - 3/5 = 5 2/5;
г) 2 -1 4/9 = 1 9/9 - 1 4/9 = 5/9;
д) 15 7/20 - 3 8/20 = 14 27/20 - 3 8/20 = 11 (27-8)/20 =11 19/20; 
е) 2 7/16 + 8/9 + 9/16 +1/9 = 2 + (7/16 + 9/16) + (8/9 +1/9) = 2+ 1 + 1 = 4.