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受欢迎的代数 >

0=100-4.9t^2

解答

0 = 100 - 4.9 t^{2}

解答

t = \frac{10 10}{7}, t = - \frac{10 10}{7}

+1

十进制

t = 4.51753 \dots, t = - 4.51753 \dots

求解步骤

0 = 100 - 4.9 t^{2}

交换两边

100 - 4.9 t^{2} = 0

将

100

到右边

- 4.9 t^{2} = - 100

在两边乘以

10

- 49 t^{2} = - 1000

两边除以

- 49

t^{2} = \frac{1000}{49}

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

t = \frac{1000}{49}, t = - \frac{1000}{49}

\frac{1000}{49} = \frac{10 10}{7}

- \frac{1000}{49} = - \frac{10 10}{7}

t = \frac{10 10}{7}, t = - \frac{10 10}{7}

作图

流行的例子

- x^{2} + 6 x + 21 = 0

x^{2} + 0.08 = 0

4 x^{2} + 1 = 2

x^2-1.6x+0.64=0

x^{2} - 1.6 x + 0.64 = 0

x^{2} = 9 (x - 2)