展开 (-r-5)/((r+1)(r-1))

解答

展开

\frac{- r - 5}{( r + 1 ) ( r - 1 )}

\frac{- r - 5}{r ^{2} - 1}

求解步骤

\frac{- r - 5}{( r + 1 ) ( r - 1 )}

乘开

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

= \frac{- r - 5}{r ^{2} - 1}

e x p an d \frac{x ^{3}}{( x - 1 ) ( x + 3 )}

e x p an d \frac{( 8 + x ) ^{3}}{8}

e x p an d (x^{2} + 1) (3 x - 1) (2 x - 3) d x

e x p an d (9 + 1 = - 5) \cdot (9 - 1 - 5)

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