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huynhtantrung
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Bai tap ve nha: Cac bai toan chung minh tinh vuong goc.
Bai 1/ 2. Chung minh tam giac SBD vuong tai S.
em ko biet chung minh lam sao? ko biet phai loi danh may ko?
Bai 2/ H,K la truc tam moi dung
em cam on.
Bai 1/ 2. Chung minh tam giac SBD vuong tai S.
em ko biet chung minh lam sao? ko biet phai loi danh may ko?
Bai 2/ H,K la truc tam moi dung
em cam on.
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