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trannhuthuat9a2
2 năm trước
Chứng minh các đa thức sau luôn dương với mọi x,y b) 4x^2-12x+11 c)x^2-x+1 d) x^-2x+y^2+4y+6 MN chỉ mik với đang cần gấp
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