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受欢迎的代数 >

-4.9x^2+25x=0

解答

- 4.9 x^{2} + 25 x = 0

解答

x = 0, x = \frac{250}{49}

+1

十进制

x = 0, x = 5.10204 \dots

求解步骤

- 4.9 x^{2} + 25 x = 0

在两边乘以

10

- 49 x^{2} + 250 x = 0

使用求根公式求解

x_{1, 2} = \frac{- 250 \pm 25 0 ^{2} - 4 ( - 49 ) \cdot 0}{2 ( - 49 )}

25 0^{2} - 4 (- 49) \cdot 0 = 250

x_{1, 2} = \frac{- 250 \pm 250}{2 ( - 49 )}

将解分隔开

x_{1} = \frac{- 250 + 250}{2 ( - 49 )}, x_{2} = \frac{- 250 - 250}{2 ( - 49 )}

x = \frac{- 250 + 250}{2 ( - 49 )} : 0

x = \frac{- 250 - 250}{2 ( - 49 )} : \frac{250}{49}

二次方程组的解是:

x = 0, x = \frac{250}{49}

作图

流行的例子

x^2-(k+2)x+2k=0

x^{2} - (k + 2) x + 2 k = 0

25 x^{2} - 121 = 0

solvefor x,x^2+x+2=0

so l v e f or x, x^{2} + x + 2 = 0

3 c^{2} + 6 = 33

(k + 2)^{2} = 12