\((1)\)计算:\({{\left( -\dfrac{1}{2} \right)}^{-1}}-\sqrt[3]{-8}=\)________.
\((2)\)如图,在横格作业纸\((\)横线等距\()\)上画了个“\(×\)”,与横格线交于\(A\)、\(B\)、\(C\)、\(D\)、\(O\)五点,若线段\(AB=4cm\),则线段\(CD=\)________\(cm\)
\((3)\)已知抛物线解析式为\(y=-x^{2}-2x+3\),当\(-2\leqslant x\leqslant 2\)时,对应的函数值\(y\)的取值范围为________.
\((4)\)如图,\(AC\)是半圆\(O\)的一条弦,以弦\(AC\)为折线将\(\overset\frown{AC}\)折叠后过圆心\(O\),若\(⊙O\)的半径为\(2\),则圆中阴影部分的面积为________.
\((5)\)如图,四边形\(ABCD\)是菱形,\(AB=2\),\(∠ABC=60^{\circ}\),点\(E\)是射线\(DA\)上一动点,把\(\triangle CDE\)沿\(CE\)折叠,其中点\(D\)的对应点为\(D{{'}}\),连接\(D{{'}}B\),若\(\triangle D{{'}}BC\)为等边三角形,则\(DE\)的长为________.