2a/a^2-4+1/2-a
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2a/a^2-4+1/2-a
=2a/(a-2)(a+2)-1/(a-2)
=(2a-a-2)/(as-2)(a+2)
=(a-2)/(a-2)(a+2)
=1/(a+2)
=2a/(a-2)(a+2)-1/(a-2)
=(2a-a-2)/(as-2)(a+2)
=(a-2)/(a-2)(a+2)
=1/(a+2)
追问
这步2a/(a-2)(a+2)-1/(a-2)
到这步 (2a-a-2)/(as-2)(a+2)
是咋变形的
追答
2a/a^2-4+1/2-a
=2a/(a-2)(a+2)-1/(a-2)=2a/(a-2)(a+2)-(a+2)/(a-2)(a+2)
=(2a-a-2)/(a-2)(a+2)
=(a-2)/(a-2)(a+2)
=1/(a+2)
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