[tex=2.786x1.143]7+oGozmyJyKX+aXnVybvOlM7IeiIegCsb9p1bU6EHxo=[/tex]对于下面定义的加法和数量乘法，是否构成实数域上的线性空间？[tex=16.786x1.357]jI1oqbiyUHYU1xbNvvBdDEK+eQqMIce2ZzExQB6wsXwIBoXH8agKmfP4I1NdeQfqwxi2TDO/FwIJtEzwbQKjRjFLbNjmsH/iaPTi8PkiqMraVa5kM6vwiJ3mbteo1VCAi6CHi/ag4qrUgb4enwyMuw==[/tex]，[tex=13.929x2.786]4B7zL+fikBtiFqoYAJO3dmCDsWJIuz2o8rMeSqg1shDuk7MIyGDrIG3bsRxWwm5/urESzzCLLk2jxeBKkAqpJg==[/tex]。