網址: https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaI2XFnznQXOu7bHihhpFtWvzKZJysg669A9AQqeyVpA9oYDICNjaIERIvp1_-BTJTTNa33gYjcZ3B0S3R7DZCBRnj0uqFzf43cozrDavDrK6ZslUc-3tjlID-pAI2INOdRIQTSqlc5yc/w1200-h630-p-k-no-nu/euler.png
網址2: https://metodosnumericosfamagu.blogspot.com/2019/11/62-metodos-de-un-paso-metodo-de-euler.html