Proszę o rozwiązanie podanych przykladów,z wyjaśnieniem poszczególnych działań.
a)
(2 + √3) ^(-2) = [ (1/(2 + √3) ] ^2 = 1^2 / (2 + √3)^2 = 1 / (4 + 4√3 + 3) = 1 / (7 + 4√3) = 1*(7 - 4√3) / (7 + 4√3)(7 - 4√3) = (7 - 4√3) / (49- 48) = (7 - 4√3) / 1 = 7 - 4√3
b)
.... = (3 + √7) / (3 - √7) = [ (3 + √7)(3 + √7) ] / [ (3 - √7)(3 + √7) ] = (3 + √7)² / (9 - 7) = (9 + 6√7 + 7) / 2 = (16 + 6√7) / 2 = 8 + 3√7
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a)
(2 + √3) ^(-2) = [ (1/(2 + √3) ] ^2 = 1^2 / (2 + √3)^2 = 1 / (4 + 4√3 + 3) = 1 / (7 + 4√3) = 1*(7 - 4√3) / (7 + 4√3)(7 - 4√3) = (7 - 4√3) / (49- 48) = (7 - 4√3) / 1 = 7 - 4√3
b)
.... = (3 + √7) / (3 - √7) = [ (3 + √7)(3 + √7) ] / [ (3 - √7)(3 + √7) ] = (3 + √7)² / (9 - 7) = (9 + 6√7 + 7) / 2 = (16 + 6√7) / 2 = 8 + 3√7