Восстанови цепочку вычислений 3/5 + 2/5 - 4/7 - 3/7 +5/9 + 8/9 3 2/7 + 3/7 - 2 1/7 + 4 3/7 - 1 1/2 + 5

3/5 + 2/5 - 4/7 - 3/7 +5/9 + 8/9 = (3/5 + 2/5) - (4/7 + 3/7) +(5/9 + 8/9)= 5/5-7/7+13/9=
13/9=1_4/9

3 2/7 + 3/7 - 2 1/7 + 4 3/7 - 1 1/2 + 5 =(3 2/7 + 3/7 - 2 1/7 + 4 3/7) - 1 1/2 + 5 =
=5_7/7-1_1/2+5=11-1_1/2=9_1/2