展开 (2n+1)/((n+1)^2)

解答

展开

\frac{2 n + 1}{( n + 1 ) ^{2}}

\frac{2 n + 1}{n ^{2} + 2 n + 1}

求解步骤

\frac{2 n + 1}{( n + 1 ) ^{2}}

(n + 1)^{2} = n^{2} + 2 n + 1

= \frac{2 n + 1}{n ^{2} + 2 n + 1}

e x p an d (8 x, 2 y) (- 4 x - y, 2 x - y)

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

e x p an d \frac{( 2 ( 6 - 2 x ) ^{3} )}{27}

e x p an d \frac{6 s ^{2} + 5}{s ( 2 s ^{2} + 4 s + 1 )}

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