★【新教學影片】提要(☆001☆):引用相乘函數求通解#01▕ Solve y'' + 2xy' + x²y = 0.

★【新教學影片】提要(☆001☆):引用相乘函數求通解#01▕ Solve y'' + 2xy' + x²y = 0.