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Toán 12: Hình học Oxyz: Cho hình lập phương ABCD.A'B'C'D'. Gọi G là trọng tâm của tam giác
9 months ago
149
Cho hình lập phương ABCD.A'B'C'D'. Gọi G là trọng tâm của tam giác B'C'D', I là trung điểmcủa AB'
a) A'D = AA' - AD
b) GB' + GA = GB + GA'
c) 6IG = 3AA' + AB + 4AD
d) Cos(A'D, IG) = √13/26
#HinhhocKhongGianOxyz
#HinhHocKhongGian
#Toan12
#HinhHoc
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