三年级：如何巧解年龄问题？画出年龄轴，抓住年龄差不变！
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| MP4 | N/A | 480P | Download |
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| MP4 | N/A | mp4a.40.2 | Download |
| MP4 | N/A | mp4a.40.5 | Download |
| MP4 | N/A | mp4a.40.2 | Download |
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姐姐9年前的年龄和弟弟6年后的年龄相等，当姐姐多少岁时，正好是弟弟年龄的4倍？
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