习题2.4

import numpy as np  
import matplotlib.pyplot as plt  
  
# 定义x的范围  
x = np.linspace(-10, 10, 400)  
  
# 创建一个2行3列的子图布局  
fig, axs = plt.subplots(2, 3, figsize=(12, 8))  
  
# 遍历每个子图  
for k, ax in enumerate(axs.flat, start=1):  
    y = k * x**2 + 2*k  
    ax.plot(x, y, label=f'$y = {k}x^2 + 2{k}$')  
    ax.set_title(f'k = {k}')  
    ax.legend()  
    ax.grid(True)  
  
# 调整子图之间的间距  
plt.tight_layout()  
  
# 显示图形  
plt.show()
 
print("学号：3008")

结果如下