拿去，二次函数存在性，通关！
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| MP4 | N/A | 480P | Descargar |
| MP4 | N/A | 480P | Descargar |
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| MP4 | N/A | 360P | Descargar |
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| MP4 | N/A | mp4a.40.2 | Descargar |
| MP4 | N/A | mp4a.40.5 | Descargar |
| MP4 | N/A | mp4a.40.2 | Descargar |
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JPEG | Origin Image | Descargar |
拿下二次函数系列第二期来啦，作为中考的常客，频次最高的压轴题考点，拿捏二次函数存在性问题就在今天！
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