展开 (2x)/((r+1)(r-1))

解答

展开

\frac{2 x}{( r + 1 ) ( r - 1 )}

\frac{2 x}{r ^{2} - 1}

求解步骤

\frac{2 x}{( r + 1 ) ( r - 1 )}

乘开

(r + 1) (r - 1) : r^{2} - 1

= \frac{2 x}{r ^{2} - 1}

e x p an d \frac{s ^{2} + s + 1}{( s ^{2} + 1 ) ^{2}}

e x p an d - \frac{2 e ^{2}}{( 1 + e ^{2} ) ^{2}}

e x p an d s (s^{2} + 5 s + 5)^{2}

e x p an d \frac{1}{4 + 9 x ^{2}}

e x p an d \frac{( 4 s + 5 )}{( ( s + 3 ) ( s - 4 ) ^{2} )}