面积 7x, 7/4 x,78-x^2,y=0

解答

面积

7 x, \frac{7}{4} x, 78 - x^{2}, y = 0

无解

求解步骤

要找到相交点，解

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

0 = 7 x : x = 0

0 = \frac{7}{4} x : x = 0

0 = 78 - x^{2} : x = 78, x = - 78

7 x = \frac{7}{4} x : x = 0

7 x = 78 - x^{2} : x = - 13, x = 6

\frac{7}{4} x = 78 - x^{2} : x = - \frac{39}{4}, x = 8

曲线没有界限

= 无解

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