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人教版八年级数学下册第110页第7题:如图,四边形ABCD中,AD∥BC,点M是AD的中点,且MB=MC.求证:四边形ABCD是等腰梯形.
Figure 7, quadrilateral ABCD, AD∥BC, point M is the midpoint of AD, and MB = MC. Prove: Quadrilateral ABCD is isosceles trapezoid.