a+(1/a)=5 হলে a/(a²+a+1) এর মান কত?

A 1

B 1/5

C 1/6

D 5

Solution

Correct Answer: Option C

দেওয়া আছে,
 a+(1/a)=5
 বা,(a²+1)/a=5
 বা, a²+1=5a

∴ a/(a²+a+1)
= a/(a²+1+a)
= a/(5a+a)
= a/6a
= 1/6

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