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9-x²>
-x²+9>0
x²-9<0
(x-3)(x+3)<0
x∈(-3;3)
Zadanie 26
(2n+3)²=4n²+12n+9=8(1/2n²+3/n+1)+1
1/2n²+3/n+1=m
8m+1