√20-√125+√425 = 2√5 - 5√5 + 5√17 = 5√17 - 3√5
(√99-√44)√11 = (3√11 - 2√11)√11 = (√11)² = 11
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√20-√125+√425 = 2√5 - 5√5 + 5√17 = 5√17 - 3√5
(√99-√44)√11 = (3√11 - 2√11)√11 = (√11)² = 11