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单位数“1”有一些特殊的性质,例如任意数以或除以1仍等于原数。解某些数学题时运用“1”的特殊性质,可达到化繁为简,化
The unit number “1” has some special properties such as any number or division by 1 still equal to the original number. The special nature of “1” can be used to solve certain mathematics problems.