规模报酬判断

def solve(____):
    A, a, b = production_func
    returns_to_scale = a + b
    if returns_to_scale > ____:
        result = "____"
    elif returns_to_scale == ____:
        result = "____"
    else:
        result = "____"
    return {"____": production_func, "____": returns_to_scale, "____": result}