展开-3(x-1=-4)x+20

解答

展开

- 3 (x - 1 = - 4) x + 20

- 3 x^{2} + 3 x = 12 x + 20

求解步骤

- 3 (x - 1 = - 4) x + 20

= - 3 x (x - 1 = - 4) + 20

乘开

- 3 x (x - 1 = - 4) : - 3 x^{2} + 3 x = 12 x

- 3 x^{2} + 3 x = 12 x + 20

e x p an d (- 1 - 37)^{3}

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

\frac{d ^{2}}{d x ^{2}} ((y) (3 x - y + 3))

e x p an d \frac{1}{S ( S ^{2} + 0.2 S + 1 )}

e x p an d (x + y - 1) d x + (y - x - 5) d y