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B1: Bất phương trình sau có nghiệm × |2$x^{2}$ -18x+13+3m|+4$x^{2}$ -18x+13+3<0 với giá trị tham số m là: A.0<m<7 B.m<0 hoặc m>7 c. 0<m<$\frac{169}{25}$ D. 1<m<$\frac{169}{25}$ B2: Với giá trị nào của m thì phương trình sau vô nghiệm $\sqrt{x^2-2m}$ +2$\sqrt{x^2-1}$ =x A. 0$\leq$ m$\leq$ $\frac{2}{3}$ B.m=0 C.m$\leq$ $\frac{2}{3}$ D.m<0 hoặc m>$\frac{2}{3}$ B3: Bất phương trình (x-4)$\sqrt{x-1}$ +2>0 có nghiệm là: A.x>2 B.x$\geq$ 1 C.x>4 D.x$\geq$ 1 và x$\neq$ 2
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