\(\Leftrightarrow\frac{3x}{2}-\frac{x}{3}+\frac{x}{2}< \frac{1}{4}-\frac{1}{2}-\frac{2}{3}\)
\(\Leftrightarrow\frac{5}{3}x< -\frac{11}{12}\Rightarrow x< -\frac{11}{20}\)
\(\Leftrightarrow\frac{3x}{2}-\frac{x}{3}+\frac{x}{2}< \frac{1}{4}-\frac{1}{2}-\frac{2}{3}\)
\(\Leftrightarrow\frac{5}{3}x< -\frac{11}{12}\Rightarrow x< -\frac{11}{20}\)
Câu 3 : Giác các bất phương trình sau
a , \(\frac{2}{x-1}< \frac{5}{2x-1}\)
b , \(\frac{1}{x+1}< \frac{1}{\left(x-1\right)^2}\)
c , \(\frac{1}{x}+\frac{2}{x+4}< \frac{3}{x+3}\)
d , \(\frac{x^2-3x+1}{x^2-1}< 1\)
e , \(\frac{3}{2-x}< 1\)
f , \(\frac{x^2+x-3}{x^2-4}\ge1\)
g , \(\frac{1}{x-1}+\frac{1}{x+2}>\frac{1}{x-2}\)
h , \(\frac{3x-4}{x-2}>1\)
i , \(\frac{2x-5}{2-x}\ge-1\)
k , \(\frac{-4}{3x+1}< \frac{3}{2-x}\)
l , \(\frac{2}{x-3}+\frac{4}{x+3}\le\frac{5x-1}{x^2-9}\)
m , \(\frac{x+1}{18}+\frac{-2x+1}{9}\le1\)
bài 1giải bpt
a) \(\frac{x+2}{3}-x+1>x+3\)
b) \(\frac{3x+5}{2}-1\le\frac{x+2}{3}+x\)
c) \(\frac{\left(x-2\right)\sqrt{x-1}}{\sqrt{x-1}}< 2\)
bài 2 \ giải hệ bpt
a) \(\left\{{}\begin{matrix}2-x>0\\2x+1>x-2\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}\frac{2x-1}{3}< -x+1\\\frac{4-3x}{2}< 3-x\end{matrix}\right.\)
c) \(\left\{{}\begin{matrix}-2x+\frac{3}{5}>\frac{3\left(2x-7\right)}{3}\\x-\frac{1}{2}< \frac{5\left(3x-1\right)}{2}\end{matrix}\right.\)
Mgọi người giúp mình với ạ
giải các bpt sau:
a) \(\frac{3}{2-x}< 1\)
b) \(\frac{3x-4}{x-2}>1\)
c) \(\frac{2x-5}{2-x}\le-1\)
d) \(2x-\frac{4x}{1-x}< \frac{4}{x-1}-2\)
e) \(\frac{2}{x-1}\le\frac{5}{2x-1}\)
f) \(\frac{x-3}{x+1}>\frac{x+5}{x-2}\)
g) \(\frac{x-3}{x+5}< \frac{1-2x}{x-3}\)
A) \(\frac{x^2-3x+24}{x^2-3x+3}\)<4
b) \(x^3-6x^2+11x-6\ge0\)
c) 2x3 - 5x2 -2x +2 < 0
d) 1< \(\frac{3x^2-7x+8}{x^2+12}\le2\)
e) \(\frac{5x-7}{x-5}
Câu 4 : Giải các phương trình sau
a , \(\)\(\frac{-25}{\left(-x+2\right)\left(-3x-2\right)}\)< 0
b , \(\frac{1}{x-1}>\frac{2}{2x-1}\)
c , \(\frac{2}{-x+3}+\frac{1}{\frac{1}{2}x-\frac{3}{2}}\le0\)
d , \(\frac{x-1}{x^2-3x+2}\le1\)
e , \(\frac{x+1}{x^2+x+2}>\frac{1}{x+1}\)
Xét dấu f(x) biết:
1) f(x) = \(\left(3x^2-x-2\right)\left(4x^2-7x-2\right)\)
2) f(x) = \(\frac{2x^2-x-15}{3x-2}\)
3) f(x) = \(\frac{5}{2x-1}+\frac{3}{5-2x}\)
4) f(x) = \(\left(5-2x\right)^2\left(x+2\right)\)
5) f(x) = \(\frac{\left(x-1\right)^2\left(3-2x\right)}{x^2+x-6}\)
xét dấu các biểu thức sau
a) \(\frac{x^2}{3x-8}\ge1\)
b) \(\frac{x^2-3x+24}{x^2-3x+3}
Câu 2 : Xét dấu các biểu thức sau :
A = \(\frac{4-3x}{2x+1}\)
B = \(1-\frac{2-x}{3x-2}\)
C = \(x\left(x-2\right)^2\left(3-x\right)\)
D = \(\frac{x\left(x-3\right)^2}{\left(x-5\right)\left(1-x\right)}\)
E = \(-x^2+x+6\)
F = \(2x^2-\left(2+\sqrt{3}\right)x+\sqrt{3}\)
G = \(\left(3x-1\right)\left(x+2\right)\)
H = \(\frac{2-3x}{5x-1}\)
K = \(\left(-x+1\right)\left(x+2\right)\left(3x+1\right)\)
L = \(2-\frac{2+x}{3x-2}\)
M = \(9x^2-1\)
N = \(-x^3+7x-6\)
O = \(x^3+x^2-5x+3\)
P = \(x^2-x-2\sqrt{2}\)
Q = \(\frac{1}{3-x}-\frac{1}{3+x}\)
R = \(\frac{x^2-6x+8}{x^2+8x-9}\)
S= \(\frac{x^2+4x+4}{x^4-2x^2}\)
T = \(\frac{\left|x+1\right|-1}{x^2+x+1}\)
Câu 1 : Xét dấu các biểu thức sau :
a , f(x) = \(\left(2x-1\right)\left(x+3\right)\)
b , f(x)= \(\left(-3x-3\right)\left(x+2\right)\left(x+3\right)\)
c , f(x) = \(\frac{-4}{3x+1}-\frac{3}{2-x}\)
d , f (x) = \(4x^2-1\)
e , f(x)= \(\left(-2x+3\right)\left(x-2\right)\left(x+4\right)\)
f , f(x) = \(\frac{2x+1}{\left(x-1\right)\left(x+2\right)}\)
g , f (x) = \(\frac{3}{2x-1}-\frac{1}{x-2}\)
h , f ( x) = \(\left(4x-1\right)\left(x+2\right)\left(3x-5\right)\left(-2x+7\right)\)