diff --git a/homework_02_numpy_matplotlib/2.3.text b/homework_02_numpy_matplotlib/2.3.text
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+import numpy as np
+Z = np.zeros((8,8),dtype=int)
+Z[1::2,::2] = 1
+Z[::2,1::2] = 1
+print(Z)
+给定一个方程组，如何求出其的方程解。有多种方法，分析各种方法的优缺点（最简单的方式是消元方）。
+import numpy as np
+a=np.array([[3,4,2],[5,3,4],[8,2,7]])
+A=np.linalg.inv(a)
+print(A)
+b=np.array([10,14,2])
+print(b)
+x=np.dot(b,A)
+print(x)