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dla x = 0
5*0 = 0
b)
dla x = 7
7 - 7 = 0
c)
dla x = 0
d)
dla x ∈ {-4, 4}
e)
dla x ∈ {-2, 2}
f)
dla x ∈ {-1, 0}
-1(-1 + 1) = 0
0(0 + 1) = 0
dla x = 0
5*0 = 0
b)
dla x = 7
7 - 7 = 0
c)
dla x = 0
d)
dla x ∈ {-4, 4}
e)
dla x ∈ {-2, 2}
f)
dla x ∈ {-1, 0}
-1(-1 + 1) = 0
0(0 + 1) = 0