填空题
\((1)\)一次函数\(y=kx+b\)与正比例函数\(y=3x\)的图象平行且经过点\((1,-1)\),则\(b\)的值为________.
\((2)\)如图,正方形\(ABCD\)的边长为\(4\),点\(E\)是\(AB\)的中点,点\(F\)是\(AC\)上的一动点,则\(EF+BF\)的最小值是________.
\((3)\)如图,已知小正方形\(ABCD\)的面积为\(1\),把它的各边延长一倍得到新正方形\(A_{1}B_{1}C_{1}D_{1}\);把正方形\(A_{1}B_{1}C_{1}D_{1}\)边长按原法延长一倍得到正方形\(A_{2}B_{2}C_{2}D_{2}\);以此进行下去\(…\),则正方形\(A_{n}B_{n}C_{n}D_{n}\)的面积为________.
\((4)\)如图,在平行四边\(ABCD\)中,\(AD=2AB\),\(F\)是\(AD\)的中点,作\(CE⊥AB\),垂足\(E\)在线段\(AB\)上,连接\(EF\)、\(CF\),则下列结论中一定成立的是________\((\)把所有正确结论的序号都填在横线上\()\).
\((1)\)\(\angle DCF=\dfrac{1}{2}\angle BCD\) ,\((2)EF=CF\);\((3)S_{\triangle BEC}=2S_{\triangle CEF}\);\((4)∠DFE=3∠AEF\)