展开 (13)/((20-x)^2)

解答

展开

\frac{13}{( 20 - x ) ^{2}}

\frac{13}{400 - 40 x + x ^{2}}

求解步骤

\frac{13}{( 20 - x ) ^{2}}

(20 - x)^{2} = 400 - 40 x + x^{2}

= \frac{13}{400 - 40 x + x ^{2}}

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