5.
对点\((x,y)\)的一次操作变换记为\(P_{1}(x,y)\),定义其变换法则如下:\(P_{1}(x,y)=(x+y,x-y)\);且规定\(P_{n}(x,y)=P_{1}(P_{n-1}(x,y))(n\)为大于\(1\)的整数\().\)如\(P_{1}(1,2)=(3,-1)\),\(P_{2}(1,2)=P_{1}(P_{1}(1,2))=P_{1}(3\),\(-1)=(2\),\(4)\),\(P_{3}(1,2)=P_{1}(P_{2}(1,2))=P_{1}(2\),\(4)=(6\),\(-2).\)则\(P_{2017}(1,-l)=(\) \()\)