Question

using suitable rearrangement and find the sum :4/7 +[-4/9]+3/7+[-13/9]?

Answer 1

= 4/7 - 4/9 + 3/7 - 13/9
= 4/7 + 3/7 - 4/9 - 13/9
= 10/7 - 17/9
= (90-119)/63
= -29/63

Answer 2

Answer:

4/7+3/7 - 4/9-13/9

(4+3)/7-(4+13)/9

7/7-17/9

1-17/9

(9-17)/9

=8/9