[代數] ring的證明
if a b c are any element in a ring (R,+,˙), prove that
a(b-c)=ab-ac
小弟的疑問是
a(b-c)=a(b"+"(-c))
請問這個+號可以隨便加進去嗎
是否需要有定理支撐呢
小弟知道這是一個很簡單的題目
但是我真的查書查不出為什麼
請各位高手指點一下小弟
萬分感恩
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