计算:2.(3/a-2+12/a²-4)÷(2/a-2-1/a+2)
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[3/(a-2)+12/(a^2-4)]÷[2/(a-2)-1/(a+2)]
=[3(a+2)/(a-2)(a+2)+12/(a-2)(a+2)]÷[2(a+2)/(a-2)(a+2)-(a-2)/(a-2)(a+2)]
=[(3a+6+12)/(a-2)(a+2)]÷[(2a+4)/(a-2)(a+2)-(a-2)/(a-2)(a+2)]
=[(3a+18)/(a-2)(a+2)]÷[(2a+4-a+2)/(a-2)(a+2)]
=[3(a+6)/(a-2)(a+2)]÷[(a+6)/(a-2)(a+2)]
=[3(a+6)/(a-2)(a+2)]*(a-2)(a+2)/(a+6)
=3
=[3(a+2)/(a-2)(a+2)+12/(a-2)(a+2)]÷[2(a+2)/(a-2)(a+2)-(a-2)/(a-2)(a+2)]
=[(3a+6+12)/(a-2)(a+2)]÷[(2a+4)/(a-2)(a+2)-(a-2)/(a-2)(a+2)]
=[(3a+18)/(a-2)(a+2)]÷[(2a+4-a+2)/(a-2)(a+2)]
=[3(a+6)/(a-2)(a+2)]÷[(a+6)/(a-2)(a+2)]
=[3(a+6)/(a-2)(a+2)]*(a-2)(a+2)/(a+6)
=3
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2014-06-07
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=7.68-【65‘、097,
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