math background geometric equations formulas and graphs written in chalk on a blackboard
ID: 2102011984
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- 大图:10080 × 4480 像素·85.34 cm × 37.93 cm·300dpi·JPG
- 中图:1000 × 444 像素·35.28 cm × 15.66 cm·72dpi·JPG
- 小图:500 × 222 像素·17.64 cm × 7.83 cm·72dpi·JPG