Giải BPT \(\frac{x-5}{x+3}>3\)
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\(5x-\frac{3-2x}{2}>\frac{7x-5}{2}+x\)
\(\Leftrightarrow\) \(\frac{10x}{2}-\frac{3-2x}{2}>\frac{7x-5}{2}+\frac{2x}{2}\)
\(\Rightarrow\) \(10x-3+2x>7x-5+2x\)
\(\Leftrightarrow\) \(10x+2x-7x-2x>-5+3\)
\(\Leftrightarrow\) \(3x>-2\)
\(\Leftrightarrow\) \(x>-\frac{2}{3}\)
Vậy ................
\(\frac{10x-5}{6}+\frac{x+3}{4}\ge\frac{7x+3}{2}-\frac{12-x}{3}\)
<=>\(\frac{2\left(10x-5\right)}{12}+\frac{3\left(x+3\right)}{12}\ge\frac{6\left(7x+3\right)}{12}-\frac{4\left(12-x\right)}{12}\)
<=>2(10x-5)+3(x+3)\(\ge\)6(7x+3)-4(12-x)
<=>20x-10+3x+9\(\ge\)42x+18-48+4x
<=>23x-1\(\ge\)46x-30
<=>23x-46x\(\ge\)-30+1
<=>-23x\(\ge\)-29
<=>x\(\le\)\(\frac{29}{23}\)
Vậy S={x I x\(\le\frac{29}{23}\)}
a) Ta có: \(3\left(x-2\right)-\left(x-5\right)>21\)
\(\Leftrightarrow3x-6-x+5>21\)
\(\Leftrightarrow2x-1>21\)
\(\Leftrightarrow2x>22\)
hay x>11
Vậy: S={x|x>11}
b) Ta có: \(5\left(x+1\right)-7\left(x-3\right)< 10\)
\(\Leftrightarrow5x+5-7x+21-10< 0\)
\(\Leftrightarrow-2x+16< 0\)
\(\Leftrightarrow-2x< -16\)
hay x>8
Vậy: S={x|x>8}
ĐKXĐ : \(x\ne-1\)
\(\left|\frac{3-2x}{1+x}\right|>4\)\(\Leftrightarrow\)\(\orbr{\begin{cases}\frac{3-2x}{1+x}>4\left(1\right)\\\frac{2x-3}{1+x}< -4\left(2\right)\end{cases}}\)
\(\left(1\right)\)\(\Leftrightarrow\)\(3-2x>4+4x\)\(\Leftrightarrow\)\(x< \frac{-1}{6}\)
\(\left(2\right)\)\(\Leftrightarrow\)\(2x-3< -4-4x\)\(\Leftrightarrow\)\(x< \frac{-1}{6}\)
Vậy \(x< \frac{-1}{6}\)
PS : ko wen làm pt nên sai sót thì bỏ qua nhé :)
a) \(\frac{x+2}{-5}\ge0\Leftrightarrow x+2\le0\Leftrightarrow x\le-2\)
b) Điều kiện : \(x\ne3\)
\(\frac{x-1}{x-3}>1\Leftrightarrow\frac{x-1-x+3}{x-3}>0\Leftrightarrow\frac{2}{x-3}>0\Leftrightarrow x-3>0\Leftrightarrow x>3\)
Vậy BĐT luôn đúng với mọi \(x>3\)
a)\(\frac{x+2}{-5}\ge0\Leftrightarrow x+2\ge0\Leftrightarrow x\ge-2\)
b)\(\frac{x-1}{x-3}>1\Leftrightarrow\frac{x-1}{x-3}-1>0\Leftrightarrow\frac{2}{x-3}>0\Leftrightarrow x=\frac{2}{0}+3\)=> vô nghiệm
ĐKXD: X khác 3
ĐK: \(x\ne-3\)
\(\frac{x-5}{x+3}>3\Rightarrow x-5>3\left(x+3\right)\)
\(\Rightarrow x-5>3x+9\Rightarrow-5-9>3x-x\Rightarrow-14>2x\Rightarrow x< -7\)
Vậy tập nghiệm của BPT: \(S=\left\{x< -7\right\}\)