展开 4[k(k+1)(k-1)]

解答

展开

4 [k (k + 1) (k - 1)]

4 k^{3} - 4 k

求解步骤

4 (k (k + 1) (k - 1))

去除括号:

(a) = a

= 4 k (k + 1) (k - 1)

乘开

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

= 4 k (k^{2} - 1)

乘开

4 k (k^{2} - 1) : 4 k^{3} - 4 k

= 4 k^{3} - 4 k

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

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

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

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

e x p an d \frac{( x + 8 ) ( x + 2 )}{x + 5}