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a) a = c, b = – d b) a = – c, b = d
c) a = d, b = c d) a = – c, b = – d
a) α + β = 3 + 2i, α - β = 3 - 2i
b) α + β = 1 + 4i α - β = 1 - 8i
c) α + β = -2i, α - β = 12i
d) α + β = 19 - 2i α - β = 11 + 2i
Ta chọn hệ trục tọa độ sao cho các đỉnh của hình lập phương có tọa độ là:
A(0; 0; 0), B(1;0; 0), D(0; 1; 0)
B’(1; 0 ; 1), D’(0; 1; 1), C’ (1; 1; 1)
d((AB′D′),(BC′D)) = d(A,(BC′D)) = 1/ 3
http://123doc.org/document/1883740-phuong-phap-dung-truc-toa-do-trong-bai-hinh-hoc-khong-gian-new.htm