(1+x)^3-(1-x)^3=2x^3

解答

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

x = 0

求解步骤

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

展开

(1 + x)^{3} - (1 - x)^{3} : 2 x^{3} + 6 x

2 x^{3} + 6 x = 2 x^{3}

将

2 x^{3}

para o lado esquerdo

6 x = 0

两边除以

6

x = 0

2 (3 x - 2) - (x + 3) = 8

(x - 3)^{2} - (x - 4)^{2} = 3

4.2 (5 x - 7) - 2.5 (2 - 4 x) = 120

\frac{x}{2} - \frac{6 - x}{4} = x + 1

so l v e f or x, x y^{2} - x + 3 y^{2} + 1 = 0