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Răspuns:
Explicație pas cu pas:
f(x) = -2x + 1
A(1, m-1) ∈ Gf
f(1) = m - 1
-2*1 + 1 = m - 1
-2 + 1 = m - 1
-1 = m - 1
m = -1 + 1 = 0