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tuyetdunf1411
2 năm trước
Đạo hàm 11. Giúp em phần nhỏ này thôi ạ! Cho 17a+9b+5c=0 (a,b,c>0). Chứng minh pt: a$x^{2}$ +bx+c=0 có nghiệm trên [1;2]
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