8.
\((1)\)化简:\(①\sqrt{{{(-0.3)}^{2}}}=\)__________;\(②\sqrt{{{(2-\sqrt{5})}^{2}}}=\)__________;\(③\sqrt{12}-\sqrt{3}=\)__________
\((2)\)定义运算“@”运算法则为:\(x\)@\(y=\sqrt{xy+4}\),则\((2\)@\(6)\)@\(8=\)__________
\((3)\)如图,\(\triangle ABC\)的周长为\(32\),且\(AB=AC\),\(AD⊥BC\)于\(D\),\(\triangle ACD\)的周长为\(24\),那么\(AD\)的长为__________
\((4)\)观察下列一组数,列举:\(3\)、\(4\)、\(5\),猜想:\(3^{2}=4+5\);列举:\(5\)、\(12\)、\(13\),猜想:\(5^{2}=12+13\);列举:\(7^{2}=24+25\),猜想:\(7^{2}=24+25\),\(……\),列举:\(13\)、\(b\)、\(c\),猜想:\(13^{2}=b+c.\)请你分析上述数据的规律,结合相关知识求得\(b=\)__________,\(c=\)__________
\((5)\)把两块含有\(30^{\circ}\)的相同的直角尺按如图所示摆放,使点\(C\)、\(B\)、\(E\)在同一条直线上,连接\(CD.\)若\(AC=6 cm\),则\(\triangle BCD\)的面积是__________
![](https://www.ebk.net.cn/tikuimages/2/2018/300/shoutiniao47/9bafcf3ad0336c231a82f0988bf7d35d.png)
\((6)\)若直角三角形的三边分别为\(a\)、\(a+b\)、\(a+2b\),则\(\dfrac{a}{b}\)的值为__________