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2 năm trước
Cho hình choóp S.ABCD có đáy ABCD là hình bình hành. Các điểm M,N,P,Q lần lượt trên các cạnh SA,SB,SC,SD thỏa $\frac{SM}{SA}$ =$\frac{1}{2}$, $\frac{SN}{SB}$ =$\frac{1}{3}$,$\frac{SP}{SC}$ =$\frac{1}{4}$, $\frac{SQ}{SD}$ =$\frac{1}{5}$, . Biết khối chóp S.ABCD là V, tỉ lệ thể tích khối tứ diện MNPQ với thể tích S.ABCD là
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