八年级外研英语周报2022第一期答案

22.(本小题满分10分)选修44:坐标系与参数方程x=2+2 cosa se(Ⅰ)由y=sina(a为参数),得(x-2)+y2=4,即x2+y2-4x=0y=psin 8代人x2+y2-4x=0,得p2∴圆C的极坐标方程为p=4cos6…………3分cos(0+7=v2U考直通率∴直线l的直角坐标方程为x-y2…5分(Ⅱ)∵直线l过点M,0,且倾斜角为1、√2∴直线的参数方程为y=2,(为参数)将直线l的参数方程代人圆C的直角坐标方程x2+y2-4x=0户3√21-=0,32设A,B对应的参数分别为,2,则t+1“2马=-<0,11|MB-M+2|6√2MA MB MAIMB…10分

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