Question

find the value of following and verify the closure property under the given operation -2/3+5/7, -6/5+(-8/3)​

Answer 1

Answer:

-2/3 + 5/7

LCM 21

-2/3*7=-14/21

5/7*3=15/21

-14/21+15/21

1/21

-6/5+(-8/3)

LCM 15

-6/5*3=-18/15

-8/3*5=-40/15

-18/15+(-40/15)

change of sign

-18/15-40/15

98/15.

that's it