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已知定点P1(x1,y1),P2(x2,y2)在直线l:Ax+By+C=0外,直线l与直线P1P2相交于点P,若P1→P=λPP→2,则称λ为直线l分P1P→2所成的
It is known that the fixed point P1 (x1, y1), P2 (x2, y2) intersects the straight line P1P2 at the point P outside the straight line l: Ax + By + C = 0. λ for the linear l points P1P → 2 into