Oblicz wartość liczbową wyrażenia :
dla x = oraz y=
[(√6 +√3)² - 2(√6 -√3)² ] / (√6 +√3)(√6 -√3) =
= [6 + 2√18 + 3 - 2(6 - 2√18 + 3)] / (√6 +√3)(√6 -√3) =
= ( 6 + 2√18 + 3 - 12 + 4√18 - 6 )/ 3 =
(6√18 - 9 ) / 3 = 2√18 - 3 = 6√2 - 3
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[(√6 +√3)² - 2(√6 -√3)² ] / (√6 +√3)(√6 -√3) =
= [6 + 2√18 + 3 - 2(6 - 2√18 + 3)] / (√6 +√3)(√6 -√3) =
= ( 6 + 2√18 + 3 - 12 + 4√18 - 6 )/ 3 =
(6√18 - 9 ) / 3 = 2√18 - 3 = 6√2 - 3