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梯形ABCD中,AD∥BC,AD⊥AB,AD=1,BC=2,AB=3,P是BC上的一个动点,当最小时,cos∠DPA的值为 .
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高一下学期数学《2017级高一年级(数学)学科学案2.5平面向量应用举例》真题及答案
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