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受欢迎的代数 >

9a^2-18a+5=0

解答

9 a^{2} - 18 a + 5 = 0

解答

a = \frac{5}{3}, a = \frac{1}{3}

+1

十进制

a = 1.66666 \dots, a = 0.33333 \dots

求解步骤

9 a^{2} - 18 a + 5 = 0

使用求根公式求解

a_{1, 2} = \frac{- ( - 18 ) \pm ( - 18 ) ^{2} - 4 \cdot 9 \cdot 5}{2 \cdot 9}

(- 18)^{2} - 4 \cdot 9 \cdot 5 = 12

a_{1, 2} = \frac{- ( - 18 ) \pm 12}{2 \cdot 9}

将解分隔开

a_{1} = \frac{- ( - 18 ) + 12}{2 \cdot 9}, a_{2} = \frac{- ( - 18 ) - 12}{2 \cdot 9}

a = \frac{- ( - 18 ) + 12}{2 \cdot 9} : \frac{5}{3}

a = \frac{- ( - 18 ) - 12}{2 \cdot 9} : \frac{1}{3}

二次方程组的解是:

a = \frac{5}{3}, a = \frac{1}{3}

作图

流行的例子

8 x^{2} + 20 x = 0

3(5x-3)^2-24=-21

3 (5 x - 3)^{2} - 24 = - 21

solvefor y,x^2-18xy+y^2=18

so l v e f or y, x^{2} - 18 x y + y^{2} = 18

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