1.
\((1)\) 选做题
\((2)\)
\(22.\)选修\(4—1\):几何证明选讲如图,\(AB\)是圆\(O\)的直径,\(C\)为圆周上一点,过\(C\)作圆\(O\)的切线\(l\),过\(A\)作直线\(l\)的垂线\(AD\),\(D\)为垂足,\(AD\)与圆\(O\)交于点\(E.(1)\)求证:\(AB·DE=BC·CE\);\((2)\)若\(AB=8\),\(BC=4\),求线段\(AE\)的长.
\((3)\)
\(23.\)选修\(4—4\):坐标系与参数方程 已知极点与直角坐标系的原点重合,极轴与\(x\)轴的正半轴重合,圆\(C\)的极坐标方程是\(ρ=a\sin θ\),直线\(l\)的参数方程是
![https://www.uuban.com/upimages/img/question/addQuestion/898/b48d7221-900e-430e-a3aa-f6dc6c406f19.png](https://www.ebk.net.cn/tikuimages/2/2016/700/shoutiniao16/4e3872427af5d3aa17110c45e248d00f.png)
\((t\)为参数\().\) \((1)\)若\(a=2\),直线\(l\)与\(x\)轴的交点是\(M\),\(N\)是圆\(C\)上一动点,求\(|MN|\)的最大值; \((2)\)直线\(l\)被圆\(C\)截得的弦长等于圆\(C\)的半径的
![https://www.uuban.com/upimages/img/question/addQuestion/395/8a425ead-4208-4c4e-a5e2-0a630abed224.png](https://www.ebk.net.cn/tikuimages/2/2016/700/shoutiniao71/c52a5145cea777bb823e77a2c702ea4f.png)
倍,求\(a\)的值.
\((4)\) 选修\(4\)--\(5\):不等式选讲 已知实数\(a\),\(b\)满足:\(a > 0\),\(b > 0.\) \((1)\)若\(x∈R\),求证:
![https://www.uuban.com/upimages/img/question/addQuestion/873/065e8b58-59c9-4c84-a9de-6df46f401fac.png](https://www.ebk.net.cn/tikuimages/2/2016/700/shoutiniao63/6733612d76242ff69d161338682d0955.png)
; \((2)\)若\(a+b=1\),求证:
![https://www.uuban.com/upimages/img/question/addQuestion/28/b1b2f7b3-822d-4f8c-a43a-fa81ed26a486.png](https://www.ebk.net.cn/tikuimages/2/2016/700/shoutiniao66/0c6f1473de77a90635431ea7307200fe.png)
.