Question

Using commutativity and associativity of addition of rational numbers, express each
of the following as a rational number:
1. 2/5+7/5+-4/5+-1/3
2. 2/5+8/3+-11/15+4/5+-2/3
3. 4/7+0+-8/9+-13/7+17/21
4. 2/7+-4/9+-11/7+7/9​

Answer 1

Answer:

1. 2/5+7/5-4/5+(-1/3)

(take LCM)

6+21-12-5/15=

27-17/15

=10/15

2/3.

2. Similarly as abov take LCM

6+40-11-12-10/15

=46-33/15

=13/15

3.4/7-8/9-13/7+17/21

Take LCM

36-56-117+51/63

=87-173/63

=-86/63.

4.simillarly take lcm

18-28-99+49/63

=67-127/63

=-60/63

-20/21

I HOPE IT WILL HELP YOU