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5[2+√3] / [2-√3][2+√3] = korzystamy ze wzoru (a-b)(a+b) = a² -b²
5[2+√3] / [2² -√3²] =
5[2+√3] / [4-3] =
5[2+√3] / 1 =
5[2+√3] =
10 +5√3