展开 In(9x(2x+5))

解答

展开

I n (9 x (2 x + 5))

18 n I x^{2} + 45 n I x

求解步骤

I n (9 x (2 x + 5))

去除括号:

(a) = a

= I n \cdot 9 x (2 x + 5)

= 9 n I x (2 x + 5)

使用分配律:

a (b + c) = ab + a c

a = I n \cdot 9 x, b = 2 x, c = 5

= I n \cdot 9 x \cdot 2 x + I n \cdot 9 x \cdot 5

= 9 \cdot 2 n I xx + 9 \cdot 5 n I x

化简

9 \cdot 2 n I xx + 9 \cdot 5 n I x : 18 n I x^{2} + 45 n I x

= 18 n I x^{2} + 45 n I x

e x p an d (7 - 4 \frac{x}{678223072849})^{20}

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

s im pl i f y 8 (z - 1) (\frac{z - 1}{2} + 1)

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

e x p an d (1 + x)^{2} cos (x)