Excel VBA 質問スレ Part19

〜スペシャル問題〜
？？？に入るベストな式を答えなさい（135点）

Sub bezier2d(x1, y1, x2, y2, x3, y3)
Dim a, b, c, d, e, f, g, h, i
a = 2 ^ 10
b = a * a
c = x1 * b
d = y1 * b
e = ？？？
f = ？？？
g = 2 * x3 - 4 * x2 + 2 * x1
h = 2 * y3 - 4 * y2 + 2 * y1
For i = 0 To a
Cells(d / b, c / b).Interior.Color = 0
c = c + e
d = d + f
e = e + g
f = f + h
Next
End Sub