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(本小题满分7分)
⑴解不等式组:
⑵如图所示,在梯形ABCD中,BC∥AD,AB=DC,点M是AD的中点.
求证:BM=CM.
(本小题满分7分)⑴解不等式组:⑵如图所示,在梯形ABCD中,BC∥AD,AB=DC,点M是AD的中点.求证:BM=CM.