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任意指定一个三位数的数字a，要求百位数的数字比个位数的数字至少大2。然后将a反转成为b，即百位数字变成个位数字，个位数字变成百位。再用a减去b得到c，将c再次反转成为d。c和d相加就会得到一个固定不变的magic数字......
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