m = Val(Text1.Text)
n = Val(Text2.Text)
s = ""
x =
For i = 1 To m
s = s + Str(x)
If Then s = s & " +"
x = x + 2
Next i
Label1.Caption = Str(m) + " ^" + Str(n) + " =" + s
上述程序段中方框处可选语句为:
①m ^ (n - 1) - m + 1
②m ^ (n - 1) - n + 1
③i < m
④i = m
则(1)(2)处填入的语句依次为( )