Question

if a,b,c are three rational numbers where a=2/3,b=4/5 and c = -5/6 verify: a+(b+c)=(a+b) +c​

Answer 1

Answer:

Given

a= 2/3

b= 4/5

c= -5/6

a +(b+c) = 2/3 + (4/5 - 5/6) = 2/3 + ( 24/30 - 25/30)

= 2/3 - 1/30 = 20/30 - 1/30 = 19/30

(a+b)+c = (2/3 + 4/5) - 5/6 = (10/15 + 12/15) - 5/6

= 22/15 - 5/6 = 44/30 - 25/30 =19/30

so both answer are same.