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dim i do i = inputbox("请输入X的值") if IsNumeric(i) then if i >= 1 then i = 0.5*i*(i+1) msgbox "X!=" & i exit do elseif i = "" then exit do else msgbox "须大于等于1" end if elseif i = "" then msgbox "不能为空值" else msgbox "不能为非数字" end if loop复制代码
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