\(x=\sqrt7+\sqrt6\) āĻšāϞ⧠\(x^3+\cfrac{1}{x^3}\) āĻāϰ āϏāϰāϞāϤāĻŽ āĻŽāĻžāύ āύāĻŋāϰā§āĻŖā§ āĻāϰāĻŋ āĨ¤
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\(âĩ x=â7+â6\)
\(â´ \cfrac{1}{x}=\cfrac{1}{â7+â6}\)
\(=\cfrac{(â7-â6)}{(â7+â6)(â7-â6)}\)
\(=\cfrac{â7-â6}{7-6}\)
\(=â7-â6\)
\(â´ x+\cfrac{1}{x}=(â7+â6)+(â7-â6)\)
\(=â7+â6+â7-â6\)
\(=2â7\)
\(x^3+\cfrac{1}{x^3}\)
\(=\left(x+\cfrac{1}{x}\right)^3-3.x.\cfrac{1}{x}\left(x+\cfrac{1}{x}\right)\)
\(=(2â7)^3-3.2â7\)
\(=56â7-6â7\)
\(=50â7\) [Answer]
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