最小二乘法

def solve():
    import numpy as np
    import matplotlib.pyplot as plt
    x = np.array(____)
    y = np.array(____)
    n = len(____)
    sum_x = np.sum(____)
    sum_y = np.sum(____)
    sum_xy = np.sum(____)
    sum_x2 = np.sum(____)
    a = (____) / (____)
    b = (____) / n
    print(____)
    plt.figure(figsize=(____, ____))
    plt.scatter(____)
    plt.plot(____)
    plt.xlabel(____)
    plt.ylabel(____)
    plt.title(____)
    plt.legend()
    plt.grid(____)
    plt.show()