(7/2a-4)-(3/2+ a)-(12/a平方-4)
=7/2(a-2)-3/(a+2)-12/(a+2)(a-2)
=[7(a+2)-6(a-2)-24]/2(a+2)(a-2)
=(a+2)/2(a+2)(a-2)
=1/2(a-2)
=1/2(-1-2)
=-1/6
(7/2a-4)-(3/2 a)-(12/a平方-4),其中a=-1
(7/2a-4)-(3/2 a)-(12/a平方-4),其中a=-1
数学人气：973 ℃时间：2020-06-19 20:44:27
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