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先分解y=[2-(2-x)]/√(2-x)=2/√(2-x)-√(2-x)=2*(2-x)^(-1/2)-(2-x)^(1/2)所以y(n)=2(-1/2)(-3/2)…(-(2n-1)/2)*(2-x)^(-(2n+1)/2)*(-1)^n-(1/2)(-1/2)…(-(2n-3)/2)*(2-x)^(-(2n-1))*(-1)^n=2*(-1)…
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