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= √5(6+√5)/2*√5*√5=(6√5+5)/10=0,6√5+0,5
6+√5 2√5 (6+√5) * √20 6√20 + 10 6√16*1,25
------ * ------ = ---------------- = ------------- = ------------- =
2√5 2√5 20 20 20
24√1,25
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20