展开 2(x+Δx)^2-3(x+Δx)

解答

展开

2 (x + Δ x)^{2} - 3 (x + Δ x)

2 x^{2} + 4Δ x^{2} + 2 Δ^{2} x^{2} - 3 x - 3Δ x

求解步骤

2 (x + Δ x)^{2} - 3 (x + Δ x)

乘开

- 3 (x + Δ x) : - 3 x - 3Δ x

= 2 (x + Δ x)^{2} - 3 x - 3Δ x

化简

2 (x + Δ x)^{2} - 3 x - 3Δ x : 2 x^{2} + 4Δ x^{2} + 2 Δ^{2} x^{2} - 3 x - 3Δ x

= 2 x^{2} + 4Δ x^{2} + 2 Δ^{2} x^{2} - 3 x - 3Δ x

\frac{d}{d t} ((x) (4 x + 7 y))

e x p an d (y cos (x)) (x + d x)

e x p an d \frac{1}{2} (1 - e^{- 10 t})

e x p an d \frac{n \cdot ( n - 3 )}{2}

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