x/y এর সাথে কত যোগ করলে যোগফল 2y/x হবে?

A (2x²-y²)/xy

B (2y²-x²)/xy

C (x²-2y²)/xy

D (x²-y²)/xy

Solution

Correct Answer: Option B

ধরি, 'ক' যোগ করলে যোগফল 2y/x হবে
প্রশ্নমতে,
(x/y) + ক = (2y/x)
⇒ ক = (2y/x) - (x/y)
      = (2y.y - x.x) / xy 
      = (2y2 - x2) / xy

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