This is an interesting common sense of mathematics, and it is also good to use it in mathematics newspapers. People call 12345679 "Leak 8". This "number without 8" has many surprising characteristics, such as multiplying by multiples of 9, and the product is actually composed of the same number. People call this "uniform". For example:12345679 * 9 =1111/kloc-0. 27 = 333333333 ... 1 2345679 * 81= 999999 These are all 9 times of1multiplied by 9. And 99, 108, 1 17 to 17 1. The final answer is:12345679 * 99 =1222212345679 *108 =13333333212345679. 444443... 12345679 * 17 1 = 2 1 1 1 165438.