Use the numbers 1 to 9 to form a nine-digit number so that the number formed by the first m digits from the left is exactly divisible by m (m=1, 2, ..., 9). What is the nine-digit number?
用数字1至9组成一个九位数，使得它从左数前m位形成的数恰能被m整除(m=1、2、…、9)，这个九位数是多少．
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