4-a/-a²+1=-( )/-(a²-1)=5(a-4)/( )填空 分式
问题描述:
4-a/-a²+1=-( )/-(a²-1)=5(a-4)/( )填空 分式
答
4-a/-a²+1=-(a-4 )/-(a²-1)=5(a-4)/5(a²-1 )
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