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受欢迎的代数 >

9y^2-3y-2=0

解答

9 y^{2} - 3 y - 2 = 0

解答

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

+1

十进制

y = 0.66666 \dots, y = - 0.33333 \dots

求解步骤

9 y^{2} - 3 y - 2 = 0

使用求根公式求解

y_{1, 2} = \frac{- ( - 3 ) \pm ( - 3 ) ^{2} - 4 \cdot 9 ( - 2 )}{2 \cdot 9}

(- 3)^{2} - 4 \cdot 9 (- 2) = 9

y_{1, 2} = \frac{- ( - 3 ) \pm 9}{2 \cdot 9}

将解分隔开

y_{1} = \frac{- ( - 3 ) + 9}{2 \cdot 9}, y_{2} = \frac{- ( - 3 ) - 9}{2 \cdot 9}

y = \frac{- ( - 3 ) + 9}{2 \cdot 9} : \frac{2}{3}

y = \frac{- ( - 3 ) - 9}{2 \cdot 9} : - \frac{1}{3}

二次方程组的解是:

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

作图

流行的例子

x^2-(2b-1)*x+(b^2-b-20)=0

x^{2} - (2 b - 1) \cdot x + (b^{2} - b - 20) = 0

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solvefor x,x^2+1+y^2+x(a-2)=0

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

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