Прогрессия
материал по информатике и икт (10 класс) на тему

Private Sub Command1_Click()

a = Val(Text1)

b = Val(Text2)

n = Val(Text3)

d = b - a

s = 0

i = a

While i <= n

s = s + i

i = i + d

Wend

Text4 = s

End Sub

Private Sub Command2_Click()

a = Val(Text1)

b = Val(Text2)

n = Val(Text3)

d = b - a

s = 1

i = a

While i <= n

s = s * i

i = i + d

Wend

Text4 = s

End Sub

Private Sub Command3_Click()

Text1 = ""

Text2 = ""

Text3 = ""

Text4 = ""

End Sub

Private Sub Command4_Click()

End

End Sub