摘要： """'17*x^2 - 16*|x|*y + 17*y^2 = 225'"""import numpy as npimport matplotlib.pyplot as pltX = np.arange(-5.0, 5.0, 0.1)Y = np.arange(-5.0, 5.0, 0.1)x, y = np.meshgrid(X, Y)f = 17 * x ** 2 - 16 * np.abs(x) * y + 17 * y ** 2 - 225fig = plt.figure()cs = plt.contour( 阅读全文