(1）λ^3-12λ^2+21λ-10=0f(λ) = λ^3-12λ^2+21λ-10f(1) =0f(λ) = (λ-1)(λ^2+aλ+10)coef.of λ-a+10=21a=-11f(λ) = (λ-1)(λ^2-11λ+10)=(λ-1)(λ-1)(λ-10)λ=1 or 10(2)λ^3-7λ^2+15λ-9=0f(λ) =λ^3...
