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受欢迎的代数 >

74.87= 1/2(10)/(32.2)x^2+8.407

解答

74.87 = \frac{1}{2} \cdot \frac{10}{32.2} \cdot x^{2} + 8.407

解答

x = \frac{10700543}{50 10}, x = - \frac{10700543}{50 10}

+1

十进制

x = 20.68868 \dots, x = - 20.68868 \dots

求解步骤

74.87 = \frac{1}{2} \cdot \frac{10}{32.2} x^{2} + 8.407

交换两边

\frac{1}{2} \cdot \frac{10}{32.2} x^{2} + 8.407 = 74.87

将

8.407

到右边

\frac{1}{2} \cdot \frac{10}{32.2} x^{2} = 66.463

化简

\frac{1}{2} \cdot \frac{10}{32.2} : \frac{5}{32.2}

\frac{5}{32.2} x^{2} = 66.463

在两边乘以

32.2

5 x^{2} = 2140.1086

两边除以

5

x^{2} = 428.02172

对于

x^{2} = f (a)

解为

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

x = 428.02172, x = - 428.02172

428.02172 = \frac{10700543}{50 10}

- 428.02172 = - \frac{10700543}{50 10}

x = \frac{10700543}{50 10}, x = - \frac{10700543}{50 10}

作图

流行的例子

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

16 x^{2} - 400 = 0

\frac{c}{4} = 16

∣ 15 x ∣ \leq 0

因式分解 x^3-2x^2-5x+6

f a c t or x^{3} - 2 x^{2} - 5 x + 6