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Mathematics, 25.07.2021 16:00 student679

TC1: Cho chóp S ABCD . , điểm M SA  , N SB  , P SC  sao cho 1 4
SM
SA
 ,
2
3
SN
SB
 ,

1
2
SP
SC
 .
a) Tìm giao tuyến của mặt phẳng   MNP với mặt phẳng   ABCD .
b) Tìm giao điểm Q của SD với mặt phẳng   MNP .
c) Tìm thiết diện của mặt phẳng   MNP với chóp.
d) Cho O AC BD   , E MP NQ   . Chứng minh rằng 3 điểm S E O , , thẳng hàng.

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TC1: Cho chóp S ABCD . , điểm M SA  , N SB  , P SC  sao cho 1 4
SM
SA
 ,
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