Question

vb求s＝1+(1+2)+(1+2+3)+(1+2+3+4)+...+(1+2+3+4+n)用

vb求s＝1+(1+2)+(1+2+3)+(1+2+3+4)+...+(1+2+3+4+n)用(响应)求s＝1+(1+2)+(1+2+3)+(1+2+3+4)+...+(1+2+3+4+n)用until求多项式，直到和大于5000将结果存入变量s中

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Answer 1

Private Sub CommandButton1_Click()
Dim i, sumi, s As Integer
i = 1
s = 0
sumi = 1
Do
i = i + 1
sumi = sumi + i
s = s + sumi
Loop Until s > 5000
TextBox1.Text = "前" & i & "项的和=" & s
End Sub