The function y = f (x) is a decreasing function defined on R and an odd function. Solve the equation f (X & # 179; - x-1) + F (X & # 178; - 1) = 0

The function y = f (x) is a decreasing function defined on R and an odd function. Solve the equation f (X & # 179; - x-1) + F (X & # 178; - 1) = 0

Equation f (X & # 179; - x-1) + F (X & # 178; - 1) = 0
That is, f (X & # 179; - x-1) = - f (X & # 178; - 1)
∵ f (x) is an odd function
∴ f(x³-x-1)=f(1-x²)
∵ f (x) is a monotone function
∴ x³-x-1=1-x²
∴ x³+x²-x-2=0
Constructor g (x) = x & # 179; + X & # 178; - X-2, that is to find the zero point of G (x)
g(1)=1+1-1-20
The zeros of (x) ∈ (1,2)