7.
计算:\( \sqrt {2}-1≈0.414, \sqrt {3}- \sqrt {2}≈0.318\);\(∴ \sqrt {2}-1 > \sqrt {3}- \sqrt {2}\);又计算:\( \sqrt {5}-2≈0.236, \sqrt {6}- \sqrt {5}≈0.213, \sqrt {7}- \sqrt {6}≈0.196\),\(∴ \sqrt {5}-2 > \sqrt {6}- \sqrt {5}\),\( \sqrt {6}- \sqrt {5} > \sqrt {7}- \sqrt {6}\).
\((1)\)分析以上结论,试写出一个一般性的命题.
\((2)\)判断该命题的真假,并给出证明.