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两直线平行是高考的热点之一.在很多教辅资料上给出了如下的两直线平行的充要条件:(1)若直线l1,l2的方程分别为y=k1x+
Two parallel lines is one of the hot spots in the college entrance examination.A lot of supplementary materials give the following two necessary and sufficient conditions for the parallel lines: (1) If the linear equations of l1 and l2 are y = k1x +