题盒微课-免费下载海量北京市区级优秀微课资源及配套资料
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比例线段-1
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https://video.cache.bdschool.cn/vd/6710d6d38a4b886179855b85ea59fe43.mp4
北京市
初三数学
15
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Jul 15, 2021
比例线段-2
二次函数的y=a(x-h)2+k 图象3
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