/// <summary>
/// 减法(返回新对象)
/// </summary>
public BigFloatData subN(double vv)
{
BigFloatData re = this.clone();
re.sub(vv);
return(re);
}
/// <summary>
/// 减法(返回新对象)
/// </summary>
public BigFloatData subN(BigFloatData data)
{
BigFloatData re = this.clone();
re.sub(data);
return(re);
}