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

A 1/6

B 1/4

C 1/5

D 1/7

Solution

Correct Answer: Option A

x+1/x=5
x2+1=5x
.'. x/x2+x+1
=x/x2+1+x
=x/5x+x
=x/6x
=1/6

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