Phương trình vô tỉ (ôn thi vào lớp 10 chuyên)
- 20/02/2023
- 205 lượt xem
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Vì $\widehat{DAE}=\widehat{BAF}$ nên $DE=BF$, suy ra tứ giác $BDEF$ là hình thang cân …