WPISZw kratki odpowiednie wyrazenie
/2 do kwadratu
(5-8n)/2=(5)/2-2razy ......razy.....+(8n)/2
(5-8n)²=(5)²-2*5*8n+(8n)²
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(5-8n)²=(5)²-2*5*8n+(8n)²