展开 dx(9x^2+7)

解答

展开

d x (9 x^{2} + 7)

9 x^{2} d x + 7 d x

求解步骤

d x (9 x^{2} + 7)

使用分配律:

a (b + c) = ab + a c

a = d x, b = 9 x^{2}, c = 7

= d x \cdot 9 x^{2} + d x \cdot 7

= 9 x^{2} d x + 7 d x

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

e x p an d - 5 (x + Δ x)^{4}

e x p an d (- 5, 1 - 65) (- 5, 8) y (- 5, - 6)

e x p an d A (- \frac{1}{2}, 3) y B (4, - \frac{2}{3})

s im pl i f y (x - \frac{7}{2}) (x + \frac{7}{3})