a/b + b/a = 1 হলে, a3 + b3 এর মান কত?
Solution
Correct Answer: Option C
দেওয়া আছে,
a/b=b/a=`1
বা, (a²+b²)/ab=1
বা,a²+b²=ab
বা,a³+b³=(a+b)(a²-ab+b²)
=(a+b)(a²+b²-ab)
=(a+b)(ab-ab)
=(a+b)⨯ 0
=0
a/b=b/a=`1
বা, (a²+b²)/ab=1
বা,a²+b²=ab
বা,a³+b³=(a+b)(a²-ab+b²)
=(a+b)(a²+b²-ab)
=(a+b)(ab-ab)
=(a+b)⨯ 0
=0
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