Question

verify a+b=b+a,if a=-2/15,b= 1/4​

Answer 1

$a + b = b + a \\ \frac{ - 2}{15} + \frac{1}{4} = \frac{1}{4} + \frac{ - 2}{15} \\ \frac{ - 8 + 15}{60} = \frac{15 - 8}{60} \\ \frac{7}{60} = \frac{7}{60}$

Answer 2

• a=-2/15,b=1/4
• a+b=b+a
• -2/15+1/4=1/4+(-2/15)
• -2*4/15*4+1*15/4*15=1*15/4*15-2*4/15*4
• -8/60+15/60=15/60-8/60
• 7/60=7/60

Hence verified

Hope it helps