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面积 x=(y^2)/4 ,x= y/2+2

解答

面积

x = \frac{y ^{2}}{4}, x = \frac{y}{2} + 2

解答

9

求解步骤

对于

x = \frac{y ^{2}}{4}

将

y

移到一边:

y = 2 x, y = - 2 x

对于

x = \frac{y}{2} + 2

将

y

移到一边:

y = 2 x - 4

f_{1} (x) = 2 x

f_{2} (x) = - 2 x

要找到相交点，解

f_{i} (x) = f_{j} (x)

2 x = - 2 x : x = 0

2 x = 2 x - 4 : x = 4

- 2 x = 2 x - 4 : x = 1

= \int_{0}^{1} ∣ f_{1} (x) - f_{2} (x) ∣ d x + \int_{1}^{4} ∣ f_{1} (x) - f_{3} (x) ∣ d x

= \int_{0}^{1} 2 x - (- 2 x) d x + \int_{1}^{4} 2 x - (2 x - 4) d x

\int_{0}^{1} 2 x - (- 2 x) d x = \frac{8}{3}

\int_{1}^{4} 2 x - (2 x - 4) d x = \frac{19}{3}

= \frac{8}{3} + \frac{19}{3}

化简

= 9

作图

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