转化公式：x = ρcosθ,y = ρsinθ,tanθ = y/x,x + y = ρ 5ρcos2θ + ρ - 24 = 0 5ρ(cosθ - sinθ) + ρ - 24 = 0 5ρcosθ - 5ρsinθ + ρ - 24 = 0 5(ρcosθ) - 5(ρsinθ) + ρ - 24 = 0 5x - 5y + x + ...