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已知两点P<sub>1</sub>(x<sub>1</sub>,y<sub>1</sub>)、P<sub>2</sub>(x<sub>2</sub>,y<sub>2</sub>)则定比分点P的坐标为若视λ为参变量,则公式(*)可看直作过两点P<sub>1</sub>(x<sub>1</sub>,y<sub>