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Private Sub CommandButton1_Click()
Z = X * Y
End Sub

Private Sub CommandButton10_Click()
Z = Z / 5
End Sub

Private Sub CommandButton2_Click()
Z = X - Y
End Sub

Private Sub CommandButton3_Click()
X = ""
Y = ""
Z = ""
End Sub

Private Sub CommandButton4_Click()
End
End Sub

Private Sub CommandButton5_Click()
Z = Val(X) + Val(Y)
End Sub

Private Sub CommandButton6_Click()
Z = X / Y
End Sub

Private Sub CommandButton7_Click()
Z = Sqr(X)
End Sub

Private Sub CommandButton8_Click()
Z = Sin(X)
End Sub

Private Sub CommandButton9_Click()
MsgBox "вы хорошо подумали"
End Sub