x+y=3 হলে x3+y3+9xy এর মান কত?

A 27

B 25

C 125

D 47

Solution

Correct Answer: Option A

x3+y3+9xy

(x+y)3-3xy(x+y)+9xy

=(3)3-3xy(3)+9xy

= 27-9xy+9xy

= 27

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