化简 (12+8k^3+3k-4k^2)+(5k^3+15-k+2k^2)

解答

化简

(12 + 8 k^{3} + 3 k - 4 k^{2}) + (5 k^{3} + 15 - k + 2 k^{2})

13 k^{3} - 2 k^{2} + 2 k + 27

求解步骤

(12 + 8 k^{3} + 3 k - 4 k^{2}) + (5 k^{3} + 15 - k + 2 k^{2})

化简

(12 + 8 k^{3} + 3 k - 4 k^{2}) + (5 k^{3} + 15 - k + 2 k^{2}) : 12 + 8 k^{3} + 3 k - 4 k^{2} + 5 k^{3} + 15 - k + 2 k^{2}

= 12 + 8 k^{3} + 3 k - 4 k^{2} + 5 k^{3} + 15 - k + 2 k^{2}

对同类项分组

= 8 k^{3} + 5 k^{3} - 4 k^{2} + 2 k^{2} + 3 k - k + 12 + 15

(x + 8) (x - 3) = 0

- x^{2} + 8 x = 0

f a c t or 5 m^{3} + 30 m^{2} - 35 m

\frac{2}{5} x - \frac{3}{2} x = \frac{3}{4} x + 3

f a c t or 2 y^{2} + 2 y - 12