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受欢迎的代数 >

3X^2+5X-2=0

解答

3 X^{2} + 5 X - 2 = 0

解答

X = \frac{1}{3}, X = - 2

+1

十进制

X = 0.33333 \dots, X = - 2

求解步骤

3 X^{2} + 5 X - 2 = 0

使用求根公式求解

X_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 \cdot 3 ( - 2 )}{2 \cdot 3}

5^{2} - 4 \cdot 3 (- 2) = 7

X_{1, 2} = \frac{- 5 \pm 7}{2 \cdot 3}

将解分隔开

X_{1} = \frac{- 5 + 7}{2 \cdot 3}, X_{2} = \frac{- 5 - 7}{2 \cdot 3}

X = \frac{- 5 + 7}{2 \cdot 3} : \frac{1}{3}

X = \frac{- 5 - 7}{2 \cdot 3} : - 2

二次方程组的解是:

X = \frac{1}{3}, X = - 2

作图

流行的例子

2x^2+25=-x^2+10x

2 x^{2} + 25 = - x^{2} + 10 x

(1 - y) (y - 1) = y^{2}

x^{2} - 5 = \frac{4 x ^{2}}{5}

-3y^2+120y-900=0

- 3 y^{2} + 120 y - 900 = 0

2 x^{2} - 8 x - 2 = 3