17.3.1 计算反向传播的梯度矩阵 公式 1,2,3,4 显示错误

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网页中1,2,3,4公式
$$z_{11} = w_{11} \cdot a_{11} + w_{12} \cdot a_{12} + w_{21} \cdot a_{21} + w_{22} \cdot a_{22} + b \tag{1}$$
$$z_{12} = w_{11} \cdot a_{12} + w_{12} \cdot a_{13} + w_{21} \cdot a_{22} + w_{22} \cdot a_{23} + b \tag{2}$$
$$z_{21} = w_{11} \cdot a_{21} + w_{12} \cdot a_{22} + w_{21} \cdot a_{31} + w_{22} \cdot a_{32} + b \tag{3}$$
$$z_{22} = w_{11} \cdot a_{22} + w_{12} \cdot a_{23} + w_{21} \cdot a_{32} + w_{22} \cdot a_{33} + b \tag{4}$$
显示错误