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Toán 12: Đúng/sai: Trong không gian Oxyz,cho ba điểm A(3;5;-1),B(7;x;1),C(9;2;y)
1 day ago
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Trong không gian Oxyz,cho ba điểm A(3;5;-1),B(7;x;1),C(9;2;y)
a) Ba điểm A,B,C thẳng hàng thì x+y=5
b) Điểm G(19/3;8/3;3) là trọng tâm tam giác ABC thì x=1;y=3
c) Tam giác ABC vuông tại A thì x=13,y=-1
d) Tích vô hướng của (AB) ⃗.(AC) ⃗=-3x+2y+41
#KhongGianOxyz
#NhanDinhDungSai
#ToanLop12
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