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受欢迎的代数 >

sqrt(-x+400)= x/(60)+5

解答

- x + 400 = \frac{x}{60} + 5

解答

x = 300

求解步骤

- x + 400 = \frac{x}{60} + 5

在两边乘以

60

- x + 400 \cdot 60 = \frac{x}{60} \cdot 60 + 5 \cdot 60

化简

- x + 400 \cdot 60 = x + 300

两边进行平方:

- 3600 x + 1440000 = x^{2} + 600 x + 90000

- 3600 x + 1440000 = x^{2} + 600 x + 90000

解

- 3600 x + 1440000 = x^{2} + 600 x + 90000 : x = 300, x = - 4500

x = 300, x = - 4500

验证解:

x = 300

真

, x = - 4500

假

解是

x = 300

作图

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