展开 (x+3)(x+1)(3x+!)

解答

展开

(x + 3) (x + 1) (3 x +!)

3! x^{3} + 12! x^{2} + 9! x

求解步骤

(x + 3) (x + 1) (3 x +!)

= (x + 3) (x + 1) (3 +! x)

乘开

(x + 3) (x + 1) : x^{2} + 4 x + 3

= (3 x +!) (x^{2} + 4 x + 3)

乘开

(3 x +!) (x^{2} + 4 x + 3) : 3! x^{3} + 12! x^{2} + 9! x

= 3! x^{3} + 12! x^{2} + 9! x

e x p an d - 3 (1 - 7 n = 9) (- 6 + 8 n)

e x p an d \frac{36}{4}

e x p an d (4, - 4, 4) x (- 3, - 7, 3)

e x p an d 2 b^{2} + 4 - 2 b^{2} - 4

e x p an d \frac{1 - e ^{- T s}}{( 10 s + 1 ) s ^{2}}