Question

$\frac{1}{4-3\sqrt{2} }$-$\frac{1}{4+3\sqrt{2} }$

решите пж срочно

Answer 1

a² - b² = (a - b)(a + b)

1/(4 - 3√2) * 1/(4 + 3√2) = 1/(4² - (3√2)²) = 1/(16 - 18) = -1/2 (если *)

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1/(4 - 3√2) - 1/(4 + 3√2) = (4 + 3√2 - (4 - 3√2))/(4 - 3√2)(4 + 3√2) = (4 + 3√2 - 4 + 3√2)/(4² - (3√2)²) = 6√2/(16 - 18) = -3√2 (если -)