Lời giải:
Kẻ OH ⊥ EF
Xét △OHA vuông tại H , ta có : OH
=> BC
Vậy BC
Câu 15 Trang 106: So sánh
Câu 17 Trang 109: Điền vào chỗ trống
I'm David Smith, husband and father , I love Photography,travel and nature. I'm working as a writer and blogger with experience of 5 years until now.
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