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設第k項是x^3 則是C6(k-1)*(x^2)^(6-k+1)*(1/ax)^(k-1) 指數=2(6-k+1)-(k-1)=3 15-3k=3 k=4 所以係數=C63*(1/a)^3=5/2 (1/a)^3=1/8 a=2
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