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How much is the vertical abab-cba-bca, abcabcabc in primary school mathematics?
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The result of subtracting three digits from four digits is three digits, which means that the highest digit is 1, so a= 1.

So we can know that b=2 from four digits and three digits.

We can know that c=9 from the ten digits of four digits and the ten digits of three digits.

So this formula is1212-921= 291.