垄断竞争厂商长期均衡

def solve(____):
    a, b = demand_func
    fc, c, d = cost_func
    q_opt = (____) ** ____
    p_opt = a - b * q_opt
    ac = fc / q_opt + c + d * q_opt
    return {"____": round(____), "____": round(____), "____": round(____), "____": ____}