[(a^2+2a)/(a^2-4)-10/(a^2+a-6)]/[1-21/(a^-4)]*(a+3)/(a-2) =[(a^2+2a)(a+3)-10(a+2)]/[(a^2-4)(a+3)-21]*(a+3)/(a-2) =[(a+5)(a^2-4)/(a+3)(a^2-4)]*(a+3)/(a-2) =(a+5)/(a-2) =(1/2+5)/(1/2-2)=-11/3 .
[(a^2+2a)/(a^2-4)-10/(a^2+a-6)]/[1-21/(a^-4)]*(a+3)/(a-2),其中
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