9.
\((1)[\)选修\(4-4\):坐标系与参数方程\(]\)
已知曲线\(C\)的极坐标方程是\(ρ=1\),以极点为原点,极轴为\(x\)轴的正半轴建立平面直角坐标系,直线\(l\)的参数方程为\(\begin{cases} & x=1+\dfrac{t}{2}, \\ & y=2+\dfrac{\sqrt{3}}{2}t, \\ \end{cases}(t\)为参数\()\)
\((\)Ⅰ\()\)写出直线\(l\)的普通方程与曲线\(C\)的直角坐标方程;
\((\)Ⅱ\()\)设曲线\(C\)经过伸缩变换\(\begin{cases} & x{{'}}=2x, \\ & y{{'}}=y, \\ \end{cases}\)得到曲线\(C{{'}}\),曲线\(C{{'}}\)上任一点为\(M(x,y)\),求\(x+2\sqrt{3}y\)的最小值.
\((2)[\)选修\(4-5\):不等式选讲\(]\)
已知函数\(f(x)=|x-3|-|x+2|\).
\((\)Ⅰ\()\)若不等式\(f(x)\geqslant |m-1|\)有解,求实数\(m\)的最小值\(M\);
\((\)Ⅱ\()\)在\((\)Ⅰ\()\)的条件下,若正数\(a\),\(b\)满足\(3a+b=-M\),证明:\(\dfrac{3}{b}+\dfrac{1}{a}\geqslant 3\).