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Trong không gian Oxyz,cho ba mặt phẳng (α):x-y+z+7=0 (β):x-y+z+19=0,(γ):x-y+z+11=0
3 months ago
69
Trong không gian Oxyz,cho ba mặt phẳng (α):x-y+z+7=0
(β):x-y+z+19=0,(γ):x-y+z+11=0.Gọi M là điểm thuộc mặt phẳng (α)
,qua M kẻ đường thẳng d cắt (β),(γ) lần lượt tại N và P (MN không vuông góc với (α)
Độ dài NP khi S=MN^2+3888/MP đạt giá trị nhỏ nhất
A.√6 B.2√6 C.12 D.2/3
#hinhhockhonggianoxyz
#hinhhockhonggian
#CachGiai
#ChuongTrinhMoi
#TOanLop12
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