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liangzidou

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Private Sub Command1_Click()
Dim r, p, t, w, pc, tc, m, a, b, ca, cb, xl, xm, xn As Double
r = 8.314
p = 101.325
t = 301
pc = 3384
tc = 460.4
w = 0.227
m = 0.37464 + 1.5422 * w + 0.2699 * w ^ 2
tr = t / tc
a = 0.45723553 * r ^ 2 * tc ^ 2 * (1 + m * (1 - Sqr(tr))) ^ 2 / pc
b = 0.077796074 * r * tc / pc
Print "a="; a, "b="; b
ca = a * p / (r ^ 2 * t ^ 2)
cb = b * p / (r * t)
xl = cb - 1
xm = -3 * cb ^ 2 - 2 * cb + ca
xn = cb ^ 3 + cb ^ 2 - ca * cb
Print "A="; ca, "B="; cb
Print "xl="; xl, "xm="; xm
Print "xn="; xn
Dim f, z As Single
z = 0.01
Do
z = z1
f = z ^ 3 + xl * z ^ 2 + xm * z + xn
f1 = 3 * z ^ 2 + 2 * xl * z + xm
z1 = z - f / f1
Loop While Abs(z - z1) >= 0.0005
Print z1
End Sub

[ Last edited by liangzidou on 2010-5-15 at 22:22 ]
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liangzidou

Òø³æ (СÓÐÃûÆø)

jjdg:°Ñ·½³Ì¾ßÌåµÄÖµ¸ø³öÀ´ 2010-04-20 12:52
·½³Ì¾ÍÊÇf = z ^ 3 + xl * z ^ 2 + xm * z + xn=0
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Dim f, z As Single
z = 0.01
Do
z = z1
f = z ^ 3 + xl * z ^ 2 + xm * z + xn
f1 = 3 * z ^ 2 + 2 * xl * z + xm
z1 = z - f / f1
Loop While Abs(z - z1) >= 0.0005
Print z1


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2Â¥2010-04-20 10:05:18
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jjdg

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3Â¥2010-04-20 12:29:43
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jjdg

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Private Sub Command1_Click()
Dim a, b, c, d, aa, bb, cc, delta, y1, y2, k, theta, t, x, x1, x2, x3, tt, tt1, xx2, xx3,s
'az^3+bz^2+cz+d=0£¬a¡¢b¡¢c¡¢dÀ´×ÔÒ»¸öÀý×Ó£¨¼û×îºó£©

a = 1
b = -70.5
c = 1533.54
d = -10082.44
aa = Round((b ^ 2 - 3 * a * c), 4)
bb = Round((b * c - 9 * a * d), 4)
cc = Round((c * c - 3 * b * d), 4)
delta = Round((bb * bb - 4 * aa * cc), 4)
If (aa = 0) And (bb = 0) Then
    x = -b / (3 * a)
    Label1.Caption = "X1=X2=X3=:" & x
Else
    Select Case delta
    Case Is > 0
        y1 = aa * b + 3 * a * (-bb + Sqr(delta)) / 2
        If y1 > 0 Then
            y1 = y1 ^ (1 / 3)
        Else
            y1 = y1 * (-1)
            y1 = y1 ^ (1 / 3) * (-1)
        End If
        y2 = aa * b + 3 * a * (-bb - Sqr(delta)) / 2
        If y2 > 0 Then
            y2 = y2 ^ (1 / 3)
        Else
            y2 = y2 * (-1)
            y2 = y2 ^ (1 / 3) * (-1)
        End If
        tt = y1 + y2
        tt1 = 3 ^ (1 / 3) * (y1 - y2) / (6 * a)
        s = (-2 * b + tt) / (6 * a)
        x1 = (-b - tt) / (3 * a)
        x2 = s & "+" & tt1 & "i"
        x3 = s & "-" & tt1 & "i"
        Label1.Caption = "X1=" & x1
        Label2.Caption = "X2=" & x2
        Label3.Caption = "X3=" & x3
    Case Is = 0
        k = bb / aa
        x1 = -b / a + k
        x = Str(-k / 2)
        Label1.Caption = "X1=" & x1
        Label2.Caption = "X2=" & x
        Label3.Caption = "X3=" & x
    Case Is < 0
        t = (2 * aa * b - 3 * a * bb) / (2 * aa ^ (3 / 2))
        theta = Atn(-t / Sqr(-t * t + 1)) + 2 * Atn(1)
        theta = theta / 3
        tt = aa ^ (1 / 2) * Cos(theta)
        tt1 = 3 ^ (1 / 2) * Sin(theta)
        x1 = (-b - 2 * tt) / (3 * a)
        xx2 = (-b + tt + tt1) / (3 * a)
        xx3 = (-b + tt - tt1) / (3 * a)
        Label1.Caption = "X1=" & x1
        Label2.Caption = "X2=" & xx2
        Label3.Caption = "X3=" & xx3        
    End Select
End If
End Sub

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[ Last edited by jjdg on 2010-4-20 at 14:20 ]
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4Â¥2010-04-20 14:18:56
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jjdg

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wangen994(½ð±Ò+5):ÐÁ¿àÁË 2010-04-20 17:38
liangzidou(½ð±Ò+28):ÎÒ֮ǰûѧ¹ý±à³ÌÓïÑÔ£¬ÏÖÔÚѧϰÈÈÁ¦Ñ§Óõ½ÕâЩ֪ʶÁË£¬ºÜÊÇ×¥¿ñ£¬¶àл´óÏÀ°ï棬ÎÒÊÔÁËÊÔ´óÏÀ¸ø±àµÄ³ÌÐò£¬½âÁ¢·½ÐÍ·½³ÌºÜºÃÓá£Ì«¸ÐлÁË£¬ÐÁ¿àÁË£¬ºÇºÇ¡£ 2010-04-20 23:10
wangen994(½ð±Ò+10, ³ÌÐòÇ¿Ìû+1):ÐÁ¿àÁË£¬ºÇºÇ 2010-04-21 08:30
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Private Sub Command1_Click()
Dim a, b, c, d, aa, bb, cc, delta, y1, y2, k, theta, t, x, x1, x2, x3, tt, tt1, xx2, xx3
'az^3+bz^2+cz+d=0
a = Val(Text1.Text)
b = Val(Text2.Text)
c = Val(Text3.Text)
d = Val(Text4.Text)

aa = Round((b ^ 2 - 3 * a * c), 4)
bb = Round((b * c - 9 * a * d), 4)
cc = Round((c * c - 3 * b * d), 4)

delta = Round((bb * bb - 4 * aa * cc), 4)

If (aa = 0) And (bb = 0) Then
    x = -b / (3 * a)
    Label1.Caption = "X1=X2=X3=:" & x
Else
    Select Case delta
    Case Is > 0
        y1 = aa * b + 3 * a * (-bb + Sqr(delta)) / 2
        If y1 > 0 Then
            y1 = y1 ^ (1 / 3)
        Else
            y1 = y1 * (-1)
            y1 = y1 ^ (1 / 3) * (-1)
        End If
        y2 = aa * b + 3 * a * (-bb - Sqr(delta)) / 2
        If y2 > 0 Then
            y2 = y2 ^ (1 / 3)
        Else
            y2 = y2 * (-1)
            y2 = y2 ^ (1 / 3) * (-1)
        End If
        tt = y1 + y2
        tt1 = 3 ^ (1 / 3) * (y1 - y2) / (6 * a)
        s = (-2 * b + tt) / (6 * a)
        x1 = (-b - tt) / (3 * a)
        x2 = s & "+" & tt1 & "i"
        x3 = s & "-" & tt1 & "i"
        Label1.Caption = "X1=" & x1
        Label2.Caption = "X2=" & x2
        Label3.Caption = "X3=" & x3
    Case Is = 0
        k = bb / aa
        x1 = -b / a + k
        x = Str(-k / 2)
        Label1.Caption = "X1=" & x1
        Label2.Caption = "X2=" & x
        Label3.Caption = "X3=" & x
    Case Is < 0
        t = (2 * aa * b - 3 * a * bb) / (2 * aa ^ (3 / 2))
        theta = Atn(-t / Sqr(-t * t + 1)) + 2 * Atn(1)
        theta = theta / 3
        tt = aa ^ (1 / 2) * Cos(theta)
        tt1 = 3 ^ (1 / 2) * Sin(theta)
        x1 = (-b - 2 * tt) / (3 * a)
        xx2 = (-b + tt + tt1) / (3 * a)
        xx3 = (-b + tt - tt1) / (3 * a)
        Label1.Caption = "X1=" & x1
        Label2.Caption = "X2=" & xx2
        Label3.Caption = "X3=" & xx3
    End Select
End If
End Sub
Private Sub Text1_Click()
Text1.SelStart = 0
Text1.SelLength = Len(Text1.Text)
End Sub
Private Sub Text2_Click()
Text2.SelStart = 0
Text2.SelLength = Len(Text2)
End Sub
Private Sub Text3_Click()
Text3.SelStart = 0
Text3.SelLength = Len(Text3)
End Sub
Private Sub Text4_Click()
Text4.SelStart = 0
Text4.SelLength = Len(Text4)
End Sub


[ Last edited by jjdg on 2010-4-20 at 14:40 ]
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5Â¥2010-04-20 14:34:06
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liangzidou

Òø³æ (СÓÐÃûÆø)

·½³Ì¾ßÌåÖµÈçÏ£º
xl=-0.9964370251388
xm=0.0345649889308
xn=-1.35939438932387E-04
Ö»µÃµ½Ò»¸öÒºÏà¸ùΪ
z=4.51886001901873E-03
6Â¥2010-04-20 23:20:50
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jjdg

°æÖ÷ (ÖªÃû×÷¼Ò)

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Сľ³æ(½ð±Ò+0.5):¸ø¸öºì°ü£¬Ð»Ð»»ØÌû½»Á÷
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Originally posted by liangzidou at 2010-04-20 23:20:50:
·½³Ì¾ßÌåÖµÈçÏ£º
xl=-0.9964370251388
xm=0.0345649889308
xn=-1.35939438932387E-04
Ö»µÃµ½Ò»¸öÒºÏà¸ùΪ
z=4.51886001901873E-03

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[ Last edited by jjdg on 2010-4-21 at 10:54 ]
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7Â¥2010-04-21 10:24:35
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jjdg

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ÓÅÐã°æÖ÷

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Dim res1
Private Sub Command1_Click()
Dim a, b, c, d, aa, bb, cc, delta, y1, y2, k, theta, t, x, x1, x2, x3, tt, tt1, xx2, xx3
'az^3+bz^2+cz+d=0
a = Val(Text1.Text)
b = Val(Text2.Text)
c = Val(Text3.Text)
d = Val(Text4.Text)

aa = Round((b ^ 2 - 3 * a * c), 4)
bb = Round((b * c - 9 * a * d), 4)
cc = Round((c * c - 3 * b * d), 4)

delta = Round((bb * bb - 4 * aa * cc), 4)

If (aa = 0) And (bb = 0) Then
    Label6.Caption = "µ±A=B=0ʱ£¬·½³ÌÓÐÒ»¸öÈýÖØÊµ¸ù"
    x = -b / (3 * a)
    Label7.Caption = "X1=X2=X3=:" & x
    Label8.Caption = ""
    Label9.Caption = ""
Else
    Select Case delta
    Case Is > 0
        y1 = aa * b + 3 * a * (-bb + Sqr(delta)) / 2
        If y1 > 0 Then
            y1 = y1 ^ (1 / 3)
        Else
            y1 = y1 * (-1)
            y1 = y1 ^ (1 / 3) * (-1)
        End If
        y2 = aa * b + 3 * a * (-bb - Sqr(delta)) / 2
        If y2 > 0 Then
            y2 = y2 ^ (1 / 3)
        Else
            y2 = y2 * (-1)
            y2 = y2 ^ (1 / 3) * (-1)
        End If
        tt = y1 + y2
        tt1 = 3 ^ (1 / 3) * (y1 - y2) / (6 * a)
        s = (-2 * b + tt) / (6 * a)
        x1 = (-b - tt) / (3 * a)
        x2 = s & "+" & tt1 & "i"
        x3 = s & "-" & tt1 & "i"
        Label6.Caption = "µ±¦¤=B^2£­4AC>0ʱ£¬·½³ÌÓÐÒ»¸öʵ¸ùºÍÒ»¶Ô¹²éîÐé¸ù"
        Label7.Caption = "X1= " & x1
        Label8.Caption = "X2=" & x2
        Label9.Caption = "X3=" & x3
    Case Is = 0
        k = bb / aa
        x1 = -b / a + k
        x = Str(-k / 2)
        Label6.Caption = "µ±¦¤=B^2£­4AC=0ʱ£¬·½³ÌÓÐÈý¸öʵ¸ù£¬ÆäÖÐÓÐÒ»¸öÁ½Öظù"
        Label7.Caption = "X1= " & x1
        Label8.Caption = "X2=" & x
        Label9.Caption = "X3=" & x
    Case Is < 0
        t = (2 * aa * b - 3 * a * bb) / (2 * aa ^ (3 / 2))
        theta = Atn(-t / Sqr(-t * t + 1)) + 2 * Atn(1)
        theta = theta / 3
        tt = aa ^ (1 / 2) * Cos(theta)
        tt1 = 3 ^ (1 / 2) * Sin(theta)
        x1 = (-b - 2 * tt) / (3 * a)
        xx2 = (-b + tt + tt1) / (3 * a)
        xx3 = (-b + tt - tt1) / (3 * a)
        Label6.Caption = "µ±¦¤=B^2£­4AC<0ʱ£¬·½³ÌÓÐÈý¸ö²»ÏàµÈµÄʵ¸ù"
        Label7.Caption = "X1= " & x1
        Label8.Caption = "X2=" & xx2
        Label9.Caption = "X3=" & xx3
    End Select
End If
res1 = Label6.Caption + vbCrLf + Label7.Caption + vbCrLf + Label8.Caption + vbCrLf + Label9.Caption
End Sub

Private Sub Command2_Click()
Clipboard.Clear
Clipboard.SetText (res1)
End Sub

Private Sub Text1_GotFocus()
Text1.SelStart = 0
Text1.SelLength = Len(Text1.Text)
End Sub
Private Sub Text2_GotFocus()
Text2.SelStart = 0
Text2.SelLength = Len(Text2)
End Sub
Private Sub Text3_GotFocus()
Text3.SelStart = 0
Text3.SelLength = Len(Text3)
End Sub
Private Sub Text4_GotFocus()
Text4.SelStart = 0
Text4.SelLength = Len(Text4)
End Sub
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8Â¥2010-04-21 10:55:12
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liangzidou

Òø³æ (СÓÐÃûÆø)

wangen994:ÇóÖúÍê³ÉÇëÔÚ±êÌâºóÌí¼Ó¡¾ÒÑÍê³É¡¿ 2010-04-21 12:26
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9Â¥2010-04-21 11:06:08
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magic7004

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