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=[a/a(a-3)-2a/(a+3)(a-3)]×[(a+3)/(a-2)]
=[(a+3)-2a]/[(a+3)(a-3)]×[(a+3)/(a-2)]
=[-(a-3)/(a-3)(a+3)]×[(a+3)/(a+2)]
=-(a+3)/(a-2)
由题可知a-3a≠0 a-9≠0 a-2≠0 即a≠2. a≠±3 a≠0
即a=-2 带入得原式=1/4
=[(a+3)-2a]/[(a+3)(a-3)]×[(a+3)/(a-2)]
=[-(a-3)/(a-3)(a+3)]×[(a+3)/(a+2)]
=-(a+3)/(a-2)
由题可知a-3a≠0 a-9≠0 a-2≠0 即a≠2. a≠±3 a≠0
即a=-2 带入得原式=1/4
追答
={[a/a(a-3)-2a]/(a+3)(a-3)}×[(a+3)/(a-2)]
=[(a+3)-2a]/[(a+3)(a-3)]×[(a+3)/(a-2)]
=[-(a-3)/(a-3)(a+3)]×[(a+3)/(a+2)]
=-(a+3)/(a-2)
由题可知a-3a≠0 a-9≠0 a-2≠0 即a≠2. a≠±3 a≠0
即a=-2 带入得原式=1/4
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