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28. Calculaţi: √20449+√285156-√54289; c) √229441+√301401-√546121; d) √2500; √2304; √3136; √5184. b) √7225; √2209;√√7056; √3969; d) √12769; √45369; √15129; √15876. √2916+√41616-√11664; d) √467856 + √264196-√√826281.​