展开 sqrt(9-x^2)(x+1)

解答

展开

9 - x^{2} (x + 1)

x 9 - x^{2} + 9 - x^{2}

求解步骤

9 - x^{2} (x + 1)

使用分配律:

a (b + c) = ab + a c

9 - x^{2} (x + 1) = 9 - x^{2} x + 9 - x^{2} \cdot 1

= 9 - x^{2} x + 9 - x^{2} \cdot 1

化简

9 - x^{2} x + 9 - x^{2} \cdot 1 : x 9 - x^{2} + 9 - x^{2}

= x 9 - x^{2} + 9 - x^{2}

s im pl i f y 7 (7 + x 21)

e x p an d (x^{\frac{4}{3}} - 4)^{2}

s im pl i f y (\frac{x}{4} + \frac{2}{3}) \times (\frac{x}{4} - \frac{2}{3})

e x p an d (2 + d t + d a)^{3}

e x p an d \frac{( 3 x - 4 ) ( x + 1 )}{88}