展开 9(x+Δx)^2-9(x+Δx)

解答

展开

9 (x + Δ x)^{2} - 9 (x + Δ x)

9 x^{2} + 18Δ x^{2} + 9 Δ^{2} x^{2} - 9 x - 9Δ x

求解步骤

9 (x + Δ x)^{2} - 9 (x + Δ x)

乘开

- 9 (x + Δ x) : - 9 x - 9Δ x

= 9 (x + Δ x)^{2} - 9 x - 9Δ x

化简

9 (x + Δ x)^{2} - 9 x - 9Δ x : 9 x^{2} + 18Δ x^{2} + 9 Δ^{2} x^{2} - 9 x - 9Δ x

= 9 x^{2} + 18Δ x^{2} + 9 Δ^{2} x^{2} - 9 x - 9Δ x

s im pl i f y 5 (25 - x^{2} + 5) 25 - x^{2}

e x p an d \frac{1}{( 3 - x ) ^{3}}

e x p an d \frac{- 3 x ^{2} - 3 x + 27}{( x + 2 ) ( 2 x ^{2} + 3 x - 9 )}

e x p an d N e^{3 x} \cdot 3 + M e^{x} + G (e^{x} + e^{x} x)

e x p an d (1 - cot (x)) (1 + cos (x))