(2-1+ 5-1)-1 এর মান কত?
সমাধান
সঠিক উত্তর: Option B
(2-1+ 5-1)-1
={(1/2 )+ (1/5)} -1
={(5 + 2)/10} - 1
=(7/10) - 1
= 1/(7/10)
= 1 × (10/7)
= 10/7
={(1/2 )+ (1/5)} -1
={(5 + 2)/10} - 1
=(7/10) - 1
= 1/(7/10)
= 1 × (10/7)
= 10/7
