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受欢迎的代数 >

(2+x)^3-2=2.8+(-3)^2

解答

(2 + x)^{3} - 2 = 2.8 + (- 3)^{2}

解答

x = 0.39861 \dots, x = - 3.19930 \dots + 2.07725 \dots i, x = - 3.19930 \dots - 2.07725 \dots i

求解步骤

(2 + x)^{3} - 2 = 2.8 + (- 3)^{2}

将

2

到右边

(2 + x)^{3} = 13.8

对于

g^{3} (x) = f (a)

解为

g (x) = 3 f (a), 3 f (a) \frac{- 1 - 3 i}{2}, 3 f (a) \frac{- 1 + 3 i}{2}

解

2 + x = 3 13.8 : x = 0.39861 \dots

解

2 + x = 3 13.8 \frac{- 1 + 3 i}{2} : x = - 3.19930 \dots + 2.07725 \dots i

解

2 + x = 3 13.8 \frac{- 1 - 3 i}{2} : x = - 3.19930 \dots - 2.07725 \dots i

解为

x = 0.39861 \dots, x = - 3.19930 \dots + 2.07725 \dots i, x = - 3.19930 \dots - 2.07725 \dots i

作图

流行的例子

2x^3-3x^2-23x+12=0

2 x^{3} - 3 x^{2} - 23 x + 12 = 0

4 = x^{5} + 2 x + 1

solvefor t,M= 5/8 pit^5

so l v e f or t, M = \frac{5}{8} π t^{5}

\frac{x ^{3} - 2}{2} = 11

solvefor x,-y=2(-x)^3

so l v e f or x, - y = 2 (- x)^{3}