Question

Let a,b,c be the three rational numbers where a=2/3,b=3/4,c=4/5 verify: a+(b+c)=(a+b)+c

Answer 1

at_answer_text_math

133/60

at_explanation_text_math

2/3 +(3/4+4/5)

2/3+(15/20+16/20)

2/3 + 31/20

40/60+93/60

133/60

thanks