北六数上《百分数》名师精讲

名师精讲1https://v.qq.com/txp/iframe/player.html?vid=i0358uofvt9&width=500&height=375&auto=0

名师精讲2https://v.qq.com/txp/iframe/player.html?vid=f03581fivyd&width=500&height=375&auto=0
名师精讲3https://v.qq.com/txp/iframe/player.html?vid=g14198c5gxs&width=500&height=375&auto=0

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