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5位數乘以1位數=5位數,高位為a*a,不進位,則a最大為3 1)若a=1,則1bcdg*1=1bcdg,不符合,捨棄 2)若a=2,2g的個位為g,則2g=g,g=0,捨棄,或者2g=10+g,g=10,捨棄 3)若a=3,a*a=9,不能進位,則g=9,而3*9=27,個位為7不為9,捨棄 囙此,無解,此題數字謎有問題
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