[[練習問題]] Sub 係数入力() Dim a As Double Dim b As Double Dim c As Double a = Range("A1").Value b = Range("B1").Value c = Range("c1").Value 解計算 a, b, c End Sub Function 解計算(ByVal a As Double, b As Double, c As Double) As Double Dim d As Double Dim x1 As Double Dim x2 As Double Dim x3 As Double d = b * b - 4 * a * c If d >= 0 Then x1 = (-b + Math.Sqr(d)) / (2 * a) x2 = (-b - Math.Sqr(d)) / (2 * a) x3 = x1 & "と" & x2 Else x1 = b / (2 * a) x2 = Sqr(-d) / (2 * a) x3 = x1 & "±" & x2 End If 表示 x3 End Function Function 表示(ByVal x3 As Double) As String Range("D1").Value = x3 End Function