作业帮一道数学分式加减
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一道数学分式加减
一道数学分式加减
一道数学分式加减
=a^2/(a-1)-(a-1)^2/(a-1)
=(a^2-a^2+2a-1)/(a-1)
=(2a-1)/(a-1)
a^2/(a-1)-(a+1) =a^2/(a-1)-(a^2-1)/(a-1) =[a^2-(a^2-1)]/(a-1) =1/(a-1)