1.

Rational the denominator of 1,7+5√2

Answer»

ANSWER:

5√2 - 7

Step-by-step explanation:

==: \frac{1}{7+5\sqrt{2} } \\==: \frac{1}{7+5\sqrt{2} } * \frac{7-5\sqrt{2}}{7-5\sqrt{2} } \\==: \frac{7-5\sqrt{2}}{49-50}\\==: \frac{7-5\sqrt{2}}{-1}\\==: {5\sqrt{2}-7

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