Toán Lớp 7: Cho a ⊥b va b ⊥ c thi
A. c // a C. a//b//c
B. b//c D. a ⊥ c
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Toán Lớp 7: Cho a ⊥b va b ⊥ c thi
A. c // a C. a//b//c
B. b//c D. a ⊥ c
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