急用请快答

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急用请快答
 

y = 2 * x / (π* 3^2) = 2 * x / (9 π)
计算溢出时间
y = 10
=> x = 45π
得到
y = 2 * x / (9 π) ( 0 = 0

1、y=2x/pi*3*3=2x/9 0<=y<=10,则 0<=x<=45
2、y=2x/9 [0,45]
=10 (45,正无穷)