=4+2+包P-2%]+1=1+2×(12家)3316……(101616分)=3或2…(11分))圆:(e-1P+=或c-P+=是(12分)》22.解:())由p=2W2sin(0+)得p2=20sin0+20c0s0,…(3分)02=x2+y2,psin0=y,0c0s0=x,.x2+2y2=2x+2y,即(x-1)2+(y-1)2=2,∴.曲线C的直角坐标方程为(x-1)2+(gy-1)2=2.……(5分)】(2)易知直线1过点P(1,0),设直线倾斜角为α,则直线1的参数方程为r=1十c0(t为参数),…(6ly tsina,分)代入(x-1)2+(y-1)2=2得t2-2 tsina-1=0,易得△>0,设A,B对应的参数分别为t,t2,则t十t2=2sin☑,tt2=-1,…(7分)t1+t2t1+t2t+t2pQl22故PA+PB2sina1t+t2t-t2√(t+t2)2-4tt√4sina+43(9分)解得sina=手则cos2a=行,ana=4tanu=士2.1的斜率为±2.…(10分)2x+2,x>1,23.解(1)f(x)=x-1+x+3)=4,-3≤x≤1.…(们-2x-2,x<-3分)当x>1时,由2x+2≤6得x≤2,.1
本文标签: