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先化简,再求值
a的平方-1(1)------------乘以(1-----------------)a-2(a-1)其中,a=-1...
a的平方-1 ( 1 )
------------乘以 (1- ---------------- )
a-2 ( a-1 )
其中,a=-1 展开
------------乘以 (1- ---------------- )
a-2 ( a-1 )
其中,a=-1 展开
1个回答
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((a^2-1)/(a-2))*(1-1/(a-1))
=((a^2-1)/(a-2))*((a-1-1)/(a-1))
=(((a+1)*(a-1))/(a-2))*((a-2)/(a-1))
=a+1
=0
=((a^2-1)/(a-2))*((a-1-1)/(a-1))
=(((a+1)*(a-1))/(a-2))*((a-2)/(a-1))
=a+1
=0
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