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chapter18有大量的公式错误

chapter18有大量的公式错误

chapter18有这种错误

![28cc748fae7ca1b1b4ecfdd87fafec3](https://user-images.githubusercontent.com/38000286/102967157-4f862100-452c-11eb-89ce-196a9fc16fb6.png) ![8a099efeab66f6a8d8ced6960c35c7e](https://user-images.githubusercontent.com/38000286/102967162-514fe480-452c-11eb-95a5-a72074f7ef8f.png) ![d78c63d198055f3c288538373750f4d](https://user-images.githubusercontent.com/38000286/102967166-52811180-452c-11eb-9176-892be1a68eb9.png)