Cho lăng trụ ABC.A′B′C′,đáy là tam giác vuông cân AC=BC=a.Lấy M,N thuộc CA′;P,Q thuộc AB' sao cho MNPQ là tứ diện đều.Biết các mặt bên của hình lăng trụ là hình chữ nhật.Tính khoảng cách giữa hai trung điểm của MN,PQ.

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