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.3.1_3.3.2两条直线的交点坐标两点间的距离情境导学素材新人教A版必修2.doc

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13.3.1-3.3.2 两条直线的交点坐标 两点间的距离【情境导学】已知二元一次方程组(1)二元一次方程组的解法有哪些?(代入消元法、加减消元法)(2)在方程组中,每一个方程都可表示为一直线,那么方程组的解说明什么?(两直线的公共部分,即交点)(3)若两直线的方程组成的二元一次方程组有解,则两直线是否相交于一点?(不一定.两条直线是否相交,取决于联立两直线方程所得的方程组是否有唯一解.若方程组有无穷多组解,则两直线重合)

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