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受欢迎的代数 >

-0.6t^2+42t=0

解答

- 0.6 t^{2} + 42 t = 0

解答

t = 0, t = 70

求解步骤

- 0.6 t^{2} + 42 t = 0

在两边乘以

10

- 6 t^{2} + 420 t = 0

使用求根公式求解

t_{1, 2} = \frac{- 420 \pm 42 0 ^{2} - 4 ( - 6 ) \cdot 0}{2 ( - 6 )}

42 0^{2} - 4 (- 6) \cdot 0 = 420

t_{1, 2} = \frac{- 420 \pm 420}{2 ( - 6 )}

将解分隔开

t_{1} = \frac{- 420 + 420}{2 ( - 6 )}, t_{2} = \frac{- 420 - 420}{2 ( - 6 )}

t = \frac{- 420 + 420}{2 ( - 6 )} : 0

t = \frac{- 420 - 420}{2 ( - 6 )} : 70

二次方程组的解是:

t = 0, t = 70

作图

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