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问题观察下列三位数的加减运算，发现了哪些规律？并证明你的发现．３２１４６１９７３８７１９８１－）１２３－）１６４－）３７９－）１７８－）１８９１９８２９７５９４６９３７９２（１）差的十位数是９．（２）差的个位数、百位数之和为９．（３）被减数的百位数与个位
Question: Observe the following three-digit addition and subtraction. And prove your discovery. 321461973871981-) 123-) 164-) 379-) 178-) 189198297594693792 (1) The tens digit of the difference is 9. (2) The difference between single digits and hundreds is 9. (3) The hundred and one digits of the subtraction