6.
\((1)\)在平面直角坐标系\(xOy\)中,双曲线\(\dfrac{x^{2}}{7}-\dfrac{y^{2}}{3}=1\)的焦距是 ______ .
\((2)\)不等式\(\dfrac{x{-}2}{x{-}1}\geqslant 2\)的解集是______ .
\((3)\)已知\(F_{1}(-4,0)\),\(F_{2}(4,0)\)动点\(M\)满足\(|MF_{1}|+|MF_{2}|=10\),则动点\(M\)的轨迹方程 ______ .
\((4)\)已知双曲线\(\dfrac{x^{2}}{16}{-}\dfrac{y^{2}}{9}{=}1\)的左支上一点\(P\)到左焦点的距离为\(10\),则点\(P\)到右焦点的距离为 ______ .
\((5)\)若数列\(\{a_{n}\}\)满足\(a_{1}=1\),\(a_{1}+2a_{2}+3a_{3}+…+na_{n}=n^{2}a_{n}\),则\(a_{2017}= \)______ .
\((6)\)已知\(m\),\(n∈R\)\({\,\!}^{+}\),\( \dfrac{1}{m}+ \dfrac{1}{n}=2 \),当\(m+n\)取最小值\(2\)时,\(m\)、\(n\)对应的点\((m,n)\)是双曲线\( \dfrac{{x}^{2}}{4}− \dfrac{{y}^{2}}{2}=1 \)一条弦的中点,则此弦所在的直线方程为 ______ .