I suppose you friend understands (-2)*2=-4,画一个数轴,零为中点,一方为正,一方为负,(-2)*2 就是他跑两个(-2)迈,最后他跑到(-4),即结果。(-2)*(-2)就是向(-2)*2的相反方向跑,最后跑到4,即结果。
I suppose you friend understands (-2)*2=-4,画一个数轴,零为中点,一方为正,一方为负,(-2)*2 就是他跑两个(-2)迈,最后他跑到(-4),即结果。(-2)*(-2)就是向(-2)*2的相反方向跑,最后跑到4,即结果。
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