0到9 随便选7个数相加等于30 这样的组合有多少就是说从0到9里面选出7个数来可以重复相加等于30,例如9993000 0003999 0030999 这样的数相加等于30的组合有多少呀那为什么是7的平方一直加到1的平
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![0到9 随便选7个数相加等于30 这样的组合有多少就是说从0到9里面选出7个数来可以重复相加等于30,例如9993000 0003999 0030999 这样的数相加等于30的组合有多少呀那为什么是7的平方一直加到1的平](/uploads/image/z/322262-62-2.jpg?t=0%E5%88%B09+%E9%9A%8F%E4%BE%BF%E9%80%897%E4%B8%AA%E6%95%B0%E7%9B%B8%E5%8A%A0%E7%AD%89%E4%BA%8E30+%E8%BF%99%E6%A0%B7%E7%9A%84%E7%BB%84%E5%90%88%E6%9C%89%E5%A4%9A%E5%B0%91%E5%B0%B1%E6%98%AF%E8%AF%B4%E4%BB%8E0%E5%88%B09%E9%87%8C%E9%9D%A2%E9%80%89%E5%87%BA7%E4%B8%AA%E6%95%B0%E6%9D%A5%E5%8F%AF%E4%BB%A5%E9%87%8D%E5%A4%8D%E7%9B%B8%E5%8A%A0%E7%AD%89%E4%BA%8E30%2C%E4%BE%8B%E5%A6%829993000+0003999+0030999+%E8%BF%99%E6%A0%B7%E7%9A%84%E6%95%B0%E7%9B%B8%E5%8A%A0%E7%AD%89%E4%BA%8E30%E7%9A%84%E7%BB%84%E5%90%88%E6%9C%89%E5%A4%9A%E5%B0%91%E5%91%80%E9%82%A3%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF7%E7%9A%84%E5%B9%B3%E6%96%B9%E4%B8%80%E7%9B%B4%E5%8A%A0%E5%88%B01%E7%9A%84%E5%B9%B3)
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