Education student homework/ class assignment concept pen with paper with math equation/ formula. Pile of books on the background.
ID: 776673958![复制](//static.hellorf.com/hellorf/_next/images/copy.svg)
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- 大图:3264 × 2448 像素·27.64 cm × 20.73 cm·300dpi·JPG
- 中图:1000 × 750 像素·35.28 cm × 26.46 cm·72dpi·JPG
- 小图:500 × 375 像素·17.64 cm × 13.23 cm·72dpi·JPG