这是描述三次方结尾问题的原程序即给定以数字1，3，7，9 为结尾的正整数x，试求一个十进制位数不超过x 的十进制位 数的正整数y使得x恰为y3的结尾数字。-This is the descr iption of the end of the third side of the original program that is given to figures 1,3,7, 9 to the end of the positive integers x, Examination for a d