√(7-√7)² - (¹/₂ - √7)²=
Pilne Szybko
√[7-√7]²-[½-√7]²=7-√7-[¼-√7+7]=7-√7-¼+√7-7=-¼
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√[7-√7]²-[½-√7]²=7-√7-[¼-√7+7]=7-√7-¼+√7-7=-¼