Răspuns:
Explicație pas cu pas:
1.
(2 - 1/2)(3 - 1/3)(4 - 1/4) : 15
= (4/2 - 1/2)(9/3 - 1/3)(16/4 - 1/4) : 15
= 3/2*8/3*15/4 : 15 = 15 : 15 = 1
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2.
f(x) = x^2 + 5
f(-x) = (-x)^2 + 5 = x^2 + 5
f(x) - f(-x) = x^2 + 5 - (x^2 + 5) = x^2 + 5 - x^2 - 5 = 0
