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    যদি x + 1/x = 5 হয়, তবে x/(x2 + x+1) এর মান কত?

A    1/5

B    1/6

C    1/7

D    1/4

Solution

Correct Answer: Option B

 

দেওয়া আছে,

x + 1/x = 5

=> (x^2 + 1) / x = 5

=> (x^2 + 1) = 5x

সুতরাং x/(x2 + x+1)

= x/(5x+ x)

= x/x(5+1)

= 1/6

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