魏雪芳 发表于 2024-10-15 11:22:05

virtualnerd.com

virtualnerd.com
Virtual Nerd: Real math help for school and home
Virtual Nerd's patent-pending tutorial system provides in-context information, hints, and links to supporting tutorials, synchronized with videos, each 3 to 7 minutes long. In this non-linear system, users are free to take whatever path through the material best serves their needs. These unique features make Virtual Nerd a viable alternative to private tutoring.
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