[tex]a, (2x+3)^2\leq 11^2\Leftrightarrow (2x+3+11)(2x+3-11)\leq 0\Leftrightarrow ...[/tex]
b,
+TH1: $x<0$ bpt vô nghiệm
+Th2: $x>0$ bpt đã cho [tex]\Leftrightarrow (x^2-2x-8)^2-(2x)^2\leq 0\Leftrightarrow (x^2-2x-8+2x)(x^2-2x-8-2x)\leq 0\Leftrightarrow ...[/tex]
c, [tex]|x^2-2x+3|\leq 10\Leftrightarrow (x^2-2x+13)(x^2-2x-7)\leq 0\Leftrightarrow ...[/tex]
d,
https://diendan.hocmai.vn/threads/giai-bat-phuong-trinh.673915/#post-3405077
e, [tex]-6|x+1|\leq (x+1)(x-10)[/tex]
+TH1: $-1<x<10$ bpt vô nghiệm
+TH2: [tex][\begin{matrix} x\leq -1\\ x\geq 10 \end{matrix}[/tex]
[tex]\Rightarrow ...[/tex]