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如图,四边形ABCD中,AD∥BC,∠A=90°,AD=1cm,AB=3cm,BC=5cm,动点P从点B出发以1cm/s的速度沿BC的方向运动,动点Q从点C出发以2cm/s的速度沿CD方向运动,P、...
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教案备课库《初二年级数学暑假作业(十二)一元二次方程1》真题及答案
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