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a)0
b)7
c)8
d)nieskończenie wiele
(x+4)(x-5)<0
(x+4)(x-5)=0
x=-4 lub x=5
parabola, ramiona do góry
x∈(-4,5)
(-4,5)nC={-3,-2,-1,0,1,2,3,4} odp.C