A = (81)x - 1 এবং B = 9x - 1 হলে, A ÷ B -এর মান কত?
সমাধান
সঠিক উত্তর: Option C
A ÷ B = A/B
= {(81)x - 1}/(9x - 1)
= {(92)x - 1}/(9x - 1)
= {(9x + 1) (9x - 1)}/(9x - 1)
= 9x + 1
= {(81)x - 1}/(9x - 1)
= {(92)x - 1}/(9x - 1)
= {(9x + 1) (9x - 1)}/(9x - 1)
= 9x + 1