abc = 5 எனில்  (\({1 \over 1 \ + \ a \ + \ b^{-1} }\) + \({1 \over 1 \ + \ b \ + \ 5 c^{-1}}\) +\(\frac{1}{1+\frac{c}{5}+a^{-1}}\) \(\))இன் மதிப்பு என்ன?

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  1. 1/2
  2. 1
  3. 1/5
  4. (a + b + c)

Answer (Detailed Solution Below)

Option 2 : 1
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Detailed Solution

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கொடுக்கப்பட்டுள்ள மதிப்பு:

abc = 5

பயன்படுத்தப்பட்டுள்ள சூத்திரம்:

abc = 5

⇒ ac =  \(5\over b \) 

⇒ (b)-1 

⇒ b = \(5\over ac\)

கணக்கீடு

\({1 \over 1 \ + \ a \ + \ b^{-1} }\) + \({1 \over 1 \ + \ b \ + \ 5 c^{-1}}\) + \(\frac{1}{1+\frac{c}{5}+a^{-1}}\)

\(\frac{1}{1+\frac{ac}{5}+a}\) + \(\frac{1}{1+\frac{5}{ac}+5c^{-1}}\) + \(\frac{1}{1+\frac{1}{ab}+a^{-1}}\)

\(5\over5+5a+ac \)\(+\) \(ac\over5+5a+ac \) \(+\) \(a\over5+a+ac \)

\(a+5+ac\over5+a+ac \)

\(1\) 

எனவே, \({1 \over 1 \ + \ a \ + \ b^{-1} }\)+\({1 \over 1 \ + \ b \ + \ 5 c^{-1}}\)+\(\frac{1}{1+\frac{c}{5}+a^{-1}}\))இன் மதிப்பு

Shortcut Trick a = b = 1 மற்றும்  c = 5 என வைத்து கொண்டால்

கொடுக்கப்பட்டுள்ள கேள்வியின்படி.

⇒ \({1 \over 1 \ + \ 1 \ + {5 \over 5 }}\) \(\frac{1}{1+\frac{5}{5}+ {1}}\) + \(\frac{1} {1+\frac{5}{5}+ {1}}\)

⇒ 1/3 + 1/3 + 1/3

⇒ 3/3 = 1

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