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受欢迎的代数 >

-y^2+17/4 y-1=0

解答

- y^{2} + \frac{17}{4} y - 1 = 0

解答

y = \frac{1}{4}, y = 4

+1

十进制

y = 0.25, y = 4

求解步骤

- y^{2} + \frac{17}{4} y - 1 = 0

在两边乘以

4

- 4 y^{2} + 17 y - 4 = 0

使用求根公式求解

y_{1, 2} = \frac{- 17 \pm 1 7 ^{2} - 4 ( - 4 ) ( - 4 )}{2 ( - 4 )}

1 7^{2} - 4 (- 4) (- 4) = 15

y_{1, 2} = \frac{- 17 \pm 15}{2 ( - 4 )}

将解分隔开

y_{1} = \frac{- 17 + 15}{2 ( - 4 )}, y_{2} = \frac{- 17 - 15}{2 ( - 4 )}

y = \frac{- 17 + 15}{2 ( - 4 )} : \frac{1}{4}

y = \frac{- 17 - 15}{2 ( - 4 )} : 4

二次方程组的解是:

y = \frac{1}{4}, y = 4

作图

流行的例子

x - 3 (x - 6) \leq 4 x

3 x^{2} - 6 x + 7 = 0

14 - x > 8

2<(x+1)^2+1<= 10

2 < (x + 1)^{2} + 1 \leq 10

2(12-y)=23-(2y-1)

2 (12 - y) = 23 - (2 y - 1)