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受欢迎的代数 >

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

解答

(x + 2) \cdot 2 x + (x - 1)^{2} = 2

解答

x = \frac{1}{3}, x = - 1

+1

十进制

x = 0.33333 \dots, x = - 1

求解步骤

(x + 2) \cdot 2 x + (x - 1)^{2} = 2

展开

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

3 x^{2} + 2 x + 1 = 2

将

2

para o lado esquerdo

3 x^{2} + 2 x - 1 = 0

使用求根公式求解

x_{1, 2} = \frac{- 2 \pm 2 ^{2} - 4 \cdot 3 ( - 1 )}{2 \cdot 3}

2^{2} - 4 \cdot 3 (- 1) = 4

x_{1, 2} = \frac{- 2 \pm 4}{2 \cdot 3}

将解分隔开

x_{1} = \frac{- 2 + 4}{2 \cdot 3}, x_{2} = \frac{- 2 - 4}{2 \cdot 3}

x = \frac{- 2 + 4}{2 \cdot 3} : \frac{1}{3}

x = \frac{- 2 - 4}{2 \cdot 3} : - 1

二次方程组的解是:

x = \frac{1}{3}, x = - 1

作图

流行的例子

因式分解 mx+m

f a c t or m x + m

2 y + 6 = 1 - 3 y

x^{2} - 8 x > - 12

2 (x + 3) = 10

化简 (476.9-475)/(475)

s im pl i f y \frac{476.9 - 475}{475}