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受欢迎的代数 >

t(t)=25-2t

解答

t (t) = 25 - 2 t

解答

t = - 1 + 26, t = - 1 - 26

+1

十进制

t = 4.09901 \dots, t = - 6.09901 \dots

求解步骤

t (t) = 25 - 2 t

展开

t (t) : t^{2}

t^{2} = 25 - 2 t

将

2 t

para o lado esquerdo

t^{2} + 2 t = 25

将

25

para o lado esquerdo

t^{2} + 2 t - 25 = 0

使用求根公式求解

t_{1, 2} = \frac{- 2 \pm 2 ^{2} - 4 \cdot 1 \cdot ( - 25 )}{2 \cdot 1}

2^{2} - 4 \cdot 1 \cdot (- 25) = 226

t_{1, 2} = \frac{- 2 \pm 2 26}{2 \cdot 1}

将解分隔开

t_{1} = \frac{- 2 + 2 26}{2 \cdot 1}, t_{2} = \frac{- 2 - 2 26}{2 \cdot 1}

t = \frac{- 2 + 2 26}{2 \cdot 1} : - 1 + 26

t = \frac{- 2 - 2 26}{2 \cdot 1} : - 1 - 26

二次方程组的解是:

t = - 1 + 26, t = - 1 - 26

作图

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