1/x-1/y = 2 এবং 1/x2 - 1/y2 = 8 হলে, 1/x+1/y = কত?
Solution
Correct Answer: Option A
দেওয়া আছে,
1/x-1/y= 2
এখন, 1/x2 - 1/y2 = (1/x)2 - (1/y)2
⇒8 = (1/x +1/y) (1/x - 1/y)
⇒ 8 = (1/x +1/y) . 2
⇒ 8/2 =1/x +1/y
⇒4= 1/x +1/y
⇒ 1/x +1/y = 4
1/x-1/y= 2
এখন, 1/x2 - 1/y2 = (1/x)2 - (1/y)2
⇒8 = (1/x +1/y) (1/x - 1/y)
⇒ 8 = (1/x +1/y) . 2
⇒ 8/2 =1/x +1/y
⇒4= 1/x +1/y
⇒ 1/x +1/y = 4
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