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受欢迎的代数 >

400=x-4*(400)/x

解答

400 = x - 4 \cdot \frac{400}{x}

解答

x = 40 (5 + 26), x = 40 (5 - 26)

+1

十进制

x = 403.96078 \dots, x = - 3.96078 \dots

求解步骤

400 = x - 4 \cdot \frac{400}{x}

化简

- 4 \cdot \frac{400}{x} : - \frac{1600}{x}

400 = x - \frac{1600}{x}

在两边乘以

x

400 x = x^{2} - 1600

解

400 x = x^{2} - 1600 : x = 40 (5 + 26), x = 40 (5 - 26)

x = 40 (5 + 26), x = 40 (5 - 26)

验证解

找到无定义的点（奇点）:

x = 0

将不在定义域的点与解相综合:

x = 40 (5 + 26), x = 40 (5 - 26)

作图

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