绘制函数和导数

def solve():
    import matplotlib.pyplot as plt
    import numpy as np
    x = np.linspace(____, ____, ____)
    a, b, c = ____, -____, ____
    y = a * x**____ + b * x + c
    dy = ____*a*x + b
    plt.figure(figsize=(____, ____))
    plt.plot(____)
    plt.plot(____)
    plt.legend()
    plt.grid(____)
    plt.show()