lean_workbook_plus_25386

import Mathlib.Analysis.Complex.Basic

theorem lean_workbook_plus_25386 : ∀ a b c : ℝ, a ∈ Set.Icc 0 1 ∧ b ∈ Set.Icc 0 1 ∧ c ∈ Set.Icc 0 1 → a / (1 + b * c) + b / (1 + a * c) + c / (1 + a * b) ≤ 1   :=  by sorry