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受欢迎的代数 >

-0.3x^2+12x=0

解答

- 0.3 x^{2} + 12 x = 0

解答

x = 0, x = 40

求解步骤

- 0.3 x^{2} + 12 x = 0

在两边乘以

10

- 3 x^{2} + 120 x = 0

使用求根公式求解

x_{1, 2} = \frac{- 120 \pm 12 0 ^{2} - 4 ( - 3 ) \cdot 0}{2 ( - 3 )}

12 0^{2} - 4 (- 3) \cdot 0 = 120

x_{1, 2} = \frac{- 120 \pm 120}{2 ( - 3 )}

将解分隔开

x_{1} = \frac{- 120 + 120}{2 ( - 3 )}, x_{2} = \frac{- 120 - 120}{2 ( - 3 )}

x = \frac{- 120 + 120}{2 ( - 3 )} : 0

x = \frac{- 120 - 120}{2 ( - 3 )} : 40

二次方程组的解是:

x = 0, x = 40

作图

流行的例子

12x^2-360x+2000=0

12 x^{2} - 360 x + 2000 = 0

solvefor x,3x^2-x^2y+y^4=1

so l v e f or x, 3 x^{2} - x^{2} y + y^{4} = 1

solvefor x,9x^2+4y^2+z^2=36

so l v e f or x, 9 x^{2} + 4 y^{2} + z^{2} = 36

z^{2} - 12 z + 6 = 0

0 = 5 x^{2} - 3 x + 1