从1到9中任选一数,乘3加3后再乘3,再把个位与十位相加,总等于9,为什么?
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![从1到9中任选一数,乘3加3后再乘3,再把个位与十位相加,总等于9,为什么?](/uploads/image/z/1618020-36-0.jpg?t=%E4%BB%8E1%E5%88%B09%E4%B8%AD%E4%BB%BB%E9%80%89%E4%B8%80%E6%95%B0%2C%E4%B9%983%E5%8A%A03%E5%90%8E%E5%86%8D%E4%B9%983%2C%E5%86%8D%E6%8A%8A%E4%B8%AA%E4%BD%8D%E4%B8%8E%E5%8D%81%E4%BD%8D%E7%9B%B8%E5%8A%A0%2C%E6%80%BB%E7%AD%89%E4%BA%8E9%2C%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
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