zadanie 8 na 152 str oblicz wortości liczbowe sum (najpierw zredukuj wyrazy podobne) n²+n-7+3n²-n-9-n+16 dla n= -½ daje naj :)
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n²+n-7+3n²-n-9-n+16=4n ²-n
4*-½ ² --½=4*0.25- -½ =0.50