m*2/m-2 -m-2
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m²/(m-2)-m-2
=m²/(m-2) -(m+2)
=[m²-(m+2)(m-2)]/(m-2)
=(m²-m²+4)/(m-2)
=4/(m-2)
=m²/(m-2) -(m+2)
=[m²-(m+2)(m-2)]/(m-2)
=(m²-m²+4)/(m-2)
=4/(m-2)
追问
a*-2a+1/(a-1)-a+2
追答
(a²-2a+1)/(a-1) -a+2
=(a-1)²/(a-1)-a+2
=a-1-a+2
=1
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