展开 (x-2)(×+2)

解答

展开

(x - 2) (\cdot + 2)

2 x - 4

求解步骤

(x - 2) (2)

= (2) (x - 2)

使用分配律:

a (b - c) = ab - a c

a = (2), b = x, c = 2

= (2) x - (2) \cdot 2

化简

(2) x - (2) \cdot 2 : 2 x - 4

= 2 x - 4

e x p an d a^{2} + (x + Δ x)^{2} - x^{2} + a^{2}

\frac{d}{d x} ((f (x, z, y)) (z x^{2} - x y^{2} - y z^{2}))

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

e x p an d (\frac{16 x - 2}{4 x ^{2} + 20}) (- 4)

e x p an d (1 - \frac{1}{2})^{21}