Question

If a,b,c are rational numbers, then associativity of rational numbers under additiob can be given by what​

Answer 1

For any three rational numbers a/b, c/d and e/f, we have

(a/b + c/d) + e/f = a/b + (c/d + e/f)

Answer 2

a +(b+c)=(a+b)+c

e.g.

1/2+(3/2+5/2)=(1/2+3/2)+5/2

1/2+8/2=4/2+5/2

9/2=9/2

LHS=RHS

hence,proved