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受欢迎的代数 >

9=39-4.9(x)^2

解答

9 = 39 - 4.9 (x)^{2}

解答

x = \frac{10 3}{7}, x = - \frac{10 3}{7}

+1

十进制

x = 2.47435 \dots, x = - 2.47435 \dots

求解步骤

9 = 39 - 4.9 x^{2}

交换两边

39 - 4.9 x^{2} = 9

将

39

到右边

- 4.9 x^{2} = - 30

在两边乘以

10

- 49 x^{2} = - 300

两边除以

- 49

x^{2} = \frac{300}{49}

对于

x^{2} = f (a)

解为

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

x = \frac{300}{49}, x = - \frac{300}{49}

\frac{300}{49} = \frac{10 3}{7}

- \frac{300}{49} = - \frac{10 3}{7}

x = \frac{10 3}{7}, x = - \frac{10 3}{7}

作图

流行的例子

化简 (1+(0.05)/(12))^{12}-1

s im pl i f y (1 + \frac{0.05}{12})^{12} - 1

化简 (9!)/(2!2!)

s im pl i f y \frac{9 !}{2 ! 2 !}

3.2 = \frac{4}{5} (b - 5)

5 x - 18 = 3 x + 42

7 x + 13 = 34