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在平面直角坐标系xOy中，抛物线C的顶点是原点，以x轴为对称轴，且经过点P（1，2）．（Ⅰ）求抛物线C的方程；（Ⅱ）设点A，B在抛物线C上，直线PA，PB分别与y轴交于点M，N，|PM|=|PN|．...
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高二下学期数学《2016级高二年级数学学科竞赛班专题学案材料序号：2》真题及答案
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在平面直角坐标系中将抛物线y=x2－x－6向上下或向左右平移m个单位使平移后的抛物线恰好经过原点则m
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