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受欢迎的代数 >

22=-2.7t^2+30t+6.5

解答

22 = - 2.7 t^{2} + 30 t + 6.5

解答

t = \frac{50 - 2035}{9}, t = \frac{50 + 2035}{9}

+1

十进制

t = 0.54322 \dots, t = 10.56788 \dots

求解步骤

22 = - 2.7 t^{2} + 30 t + 6.5

在两边乘以

10

220 = - 27 t^{2} + 300 t + 65

交换两边

- 27 t^{2} + 300 t + 65 = 220

将

220

para o lado esquerdo

- 27 t^{2} + 300 t - 155 = 0

使用求根公式求解

t_{1, 2} = \frac{- 300 \pm 30 0 ^{2} - 4 ( - 27 ) ( - 155 )}{2 ( - 27 )}

30 0^{2} - 4 (- 27) (- 155) = 62035

t_{1, 2} = \frac{- 300 \pm 6 2035}{2 ( - 27 )}

将解分隔开

t_{1} = \frac{- 300 + 6 2035}{2 ( - 27 )}, t_{2} = \frac{- 300 - 6 2035}{2 ( - 27 )}

t = \frac{- 300 + 6 2035}{2 ( - 27 )} : \frac{50 - 2035}{9}

t = \frac{- 300 - 6 2035}{2 ( - 27 )} : \frac{50 + 2035}{9}

二次方程组的解是:

t = \frac{50 - 2035}{9}, t = \frac{50 + 2035}{9}

作图

流行的例子

- 9 x^{2} + 4 x = 0

solvefor y,0=3y-2xy-3y^2

so l v e f or y, 0 = 3 y - 2 x y - 3 y^{2}

solvefor x,ax^2+bx=-c

so l v e f or x, a x^{2} + b x = - c

4 x^{2} + 10 x - 15 = 0

x^{2} - 10 \cdot x + 24 = 0