Question

ПОМОГИТЕ РЕШИТЬ!

2/5 + 1/5 + 2/5 - 3/7 + 1/7 + 2/7 =

15/17 + 7/17 - 12/17 + 7/9 - 4/9 + 5/9 =

1 - 1/11 - 3/11 - 7/11 + 3/17 + 12/17 =

7/8 + 1/8 - 2/9 - 5/9 +4/9 + 2/9 =

4/15 - 2/15 + 3/15 - 10/16 + 3/16 +7/16 =

1 - 3/14 - 11/14 + 7/9 - 5/9 + 6/9 =

Answer 1

1) 1-3/7+3/7=1

2) 10/17+8/9=(10*9+8*17)/153=226/153=1 73/153

3) 1-1+15/17=15/17

4) 1-7/9+6/9=8/9

5) 5/15-10/16+10/16=5/15=1/3

6) 1-1+2/9+6/9=8/9.