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-2√7+5√7-8√7+3√7-5√7+7√7 = 0 se eliliman todas las raices
(2+√7) . √3 = 2√3 + √21
(11+√2)² = 11²+2*11*√2 + (√2)²
121 +22√2 + 2
123 + 22√2
saludos