f(x) = x!! × x³ ÷ x(x)
f(5) = 5!! ÷ 5³ ÷ 5(5)
= (5 × 3) × (5 × 5 × 5) ÷ 5(5)
=
= 0,6 × 125
= 75
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f(x) = x!! × x³ ÷ x(x)
f(5) = 5!! ÷ 5³ ÷ 5(5)
= (5 × 3) × (5 × 5 × 5) ÷ 5(5)
=
= 0,6 × 125
= 75