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hoangvi0206
2 năm trước
1.Nghiệm của bất phương trình 4-x/2x+1>0 2.Tìm điều kiên của bất phương trình sau: cân x-3/ x^2-16 3.Nhị thức f(x)=5x-2 dương khi nào 4. Tam thức g(x)=-x^2+3x-2 âm khi nào
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