题目内容
(请给出正确答案)
[主观题]
求函数f(x.y)=x2</sup>-2x+2y在矩形区域D={(x,y)|0≤x≤3,0≤y≤2}上的最大值和最小值
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设函数f(x)连续且恒大于零,
其中Ω(t)={(x,y,z)|x2+y2+z2≤t},D(t)={(x,y)|x2+y2≤t).
(1)讨论F(t)在区间(0,+∞)内的单调性;
(2)证明当t>0时,
用二分法求函数f(x)=x^3-6x-1=0在x=2~5范围内的x=2附近的一个实根,其计算误差为|xl-x2|<10^(-6)。完善下列程序。
Private Sub Command1 _Click ()
Dim V0 As Singke, v As Single, s As String
Dim x As Single, t As Single, x1 As Single, x2 As Single
x1 =0: x2=5
Do While()
x = (x1 +x2)/2
If Sgn(f1 (x)) = 1 Then
x2 = x
Else
x1 = x
End If
Loop
Print "x = "; x
End Sub
Private Function f1 (x As Single) As Single
f1 = x * x * x -6 * x-1
End Function