展开-n(δ+xy)x

解答

展开

- n (δ + x y) x

- δ n x - n x^{2} y

求解步骤

- n (δ + x y) x

= - n x (δ + x y)

使用分配律:

a (b + c) = ab + a c

a = - n x, b = δ, c = x y

= - n x δ + (- n x) x y

使用加减运算法则

+ (- a) = - a

= - δ n x - n xx y

n xx y = n x^{2} y

= - δ n x - n x^{2} y

e x p an d π (4 - h^{2}) h

e x p an d ((\frac{4}{3 x}) + 4 x^{\frac{1}{2}})^{4}

e x p an d 144 (\frac{x ^{2}}{9} + \frac{y ^{2}}{16} = \frac{5}{4})

e x p an d \frac{7 x + 4}{( 24 x + 4 ) ( x - 5 )}

e x p an d x \cdot (- 1, 0, 1) + (\frac{- y + x}{2}) \cdot (0, - 8, 0)