[a^2-4/(a-3)(a+2)+(a+2)/a-3]除以a+1/a-3
问题描述：
[a^2-4/(a-3)(a+2)+(a+2)/a-3]除以a+1/a-3
答
[a^2-4/(a-3)(a+2)+(a+2)/a-3]除以a+1/a-3
=[(a+2)(a-2)/(a-3)(a+2)+(a+2)/(a-3)] x(a-3)/(a+1)
=(a-2+a+2)/(a-3) x(a-3)(a+1)
=2a/(a+1)
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