(√5-2√7)²=
(√5-2√7)²=5-4√35+28=33-4√35
(√5-2√7)²=5-4√35+28= 33-4√35
;))
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(√5-2√7)²=5-4√35+28=33-4√35
(√5-2√7)²=5-4√35+28= 33-4√35
;))