2/(√5-√3) এর মান কত? (তিন দশমিক স্থান পর্যন্ত)

A 3.972

B 3.968

C 3.998

D 1.789

Solution

Correct Answer: Option B

2/(√5-√3)
= 2(√5+√3)/[(√5-√3)(√5+√3)]
= 2(√5+√3)/((√5)² - (√3)²)
= 2(√5+√3)/(5-3)
= 2(√5+√3)/2
= √5+√3
এখানে,
√5 = 2.236067...
√3 = 1.732050...

∴ √5+√3 = 2.236067... + 1.732050...
= 3.968117...

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