展开 ((5x+7)(2x-1))x

解答

展开

((5 x + 7) (2 x - 1)) x

10 x^{3} + 9 x^{2} - 7 x

求解步骤

((5 x + 7) (2 x - 1)) x

去除括号:

(a) = a

= (5 x + 7) (2 x - 1) x

= x (5 x + 7) (2 x - 1)

乘开

(5 x + 7) (2 x - 1) : 10 x^{2} + 9 x - 7

= x (10 x^{2} + 9 x - 7)

乘开

x (10 x^{2} + 9 x - 7) : 10 x^{3} + 9 x^{2} - 7 x

= 10 x^{3} + 9 x^{2} - 7 x

e x p an d (\frac{3}{e ^{4}} + \frac{3}{e ^{16}} + \frac{3}{e ^{36}}) 2

s im pl i f y \frac{1}{3} (lo g_{3} (x^{2} y) - 2)

e x p an d - \frac{14}{( 7 - x ) ^{3}}

e x p an d (e^{x} cos (e^{x}) - sin (e^{x})) \cdot e^{x} cos (x)

e x p an d (3 x^{2} + y^{4}) \cdot 3 u v^{2} + 4 x y^{3} \cdot e^{w}