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22.解:(1)曲线C的极坐标方程可化为3p2 (psin0)2=12,即3.x2 4y2=12,所以曲线C的直角坐标方程为 二=1,·…5分43(2)直线1的参数方程可以标准化为2(m为参数),2联立直线1的参数方程与曲线C的直角坐标方程得m 2m-5=0,W2由韦达定理知网 属=210,mm=-7根据m的几何意义知|PA PB曰m,-m,=(m m,)-4m,m=28812V2V497所以PA PB=12210分
第一节(满分15分)One possible versionDear TonyI am sorry to hear that you want to drop out and hunt for a job owing to your poor math. I strongly oppose your idea,since you can hardly find a suitable job as a high school student.Here are some suggestions on how to improve your math. Listen carefully to the teacher in class and do timely revisionafter class. Do more math exercises than others and ask your classmates or teacher for help when encountering some problemsI do hope you think twice before making a final decisionBest wishes!Yours