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xuannghe2
2 năm trước
Giúp mik vs mai mik thi rồi. Bài 1: Cho tam giác ABC vuông tại B có góc C= 60 độ. a, Chứng minh rằng cạnh BC= 1/2AC b, Nêu phát biểu về tam giác vuông có tính chất như trên.
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