\(\frac{2x}{5}+\frac{3-2x}{3}\ge\frac{3x+2}{2}\)

\(\Leftrightarrow\)\(\frac{12x}{30}+\frac{10\left(3-2x\right)}{30}\ge\frac{15\left(3x+2\right)}{30}\)

\(\Leftrightarrow\)12x + 30 - 20x \(\ge\) 45x + 30

\(\Leftrightarrow\) 12x - 20x - 45x \(\ge\) -30 + 30

\(\Leftrightarrow\)- 53x \(\ge\)0

\(\Leftrightarrow\)x \(\le\)0

Vậy bất phương trình có nghiệm là : x \(\le0\)

b) \(1-\frac{2x-5}{6}>\frac{3-x}{4}\)

\(\Leftrightarrow\)\(\frac{12}{12}-\frac{2\left(2x-5\right)}{12}>\frac{3\left(3-x\right)}{12}\)

\(\Leftrightarrow\) 12 - 4x + 10 > 9 - 3x

\(\Leftrightarrow\)-4x + 3x > -12 - 10 + 9

\(\Leftrightarrow\)-x > -13

\(\Leftrightarrow\)x < 13

Vậy bất phương trình có nghiệm là : x < 13

1)

a) \(\frac{x+5}{3x-6}-\frac{1}{2}=\frac{2x-3}{2x-4}< =>\frac{2\left(x+5\right)}{2\left(3x-6\right)}-\frac{3x-6}{2\left(3x-6\right)}=\frac{3\left(2x-3\right)}{3\left(2x-4\right)}.\)

(đk:x khác \(\frac{1}{2}\))

\(\frac{2x+10}{6x-12}-\frac{3x-6}{6x-12}=\frac{6x-9}{6x-12}< =>2x+10-3x+6=6x-9< =>x=\frac{25}{7}\)

Vậy x=\(\frac{25}{7}\)

b) /7-2x/=x-3 \(x\ge\frac{7}{2}\)

(đk \(x\ge3,\frac{7}{2}< =>x\ge\frac{7}{2}\))

\(\Rightarrow\orbr{\begin{cases}7-2x=x-3\\7-2x=-\left(x-3\right)\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{10}{3}\left(< \frac{7}{2}\Rightarrow l\right)\\x=4\left(tm\right)\end{cases}}}\)

Vậy x=4

2)

\(\frac{x-1}{2}+\frac{x-2}{3}+\frac{x-3}{4}>\frac{x-4}{5}+\frac{x-5}{6}\)

\(\Leftrightarrow\frac{30\left(x-1\right)}{60}+\frac{20\left(x-2\right)}{60}+\frac{15\left(x-3\right)}{60}-\frac{12\left(x-4\right)}{60}-\frac{10\left(x-5\right)}{60}>0\)

\(\Leftrightarrow30x-30+20x-40+15x-45-12x+48-10x+50>0\Leftrightarrow43x-17>0\Leftrightarrow x>\frac{17}{43}\)

\(\frac{2x}{5}+\frac{3-2x}{3}\ge\frac{3x+2}{2}\)

\(\Rightarrow\frac{12x}{30}+\frac{10\left(3-2x\right)}{30}-\frac{15\left(3x+2\right)}{30}\ge0\)

\(\Rightarrow12x+30-20x-45x-30\ge0\)

\(\Rightarrow-53x\ge0\)\(\Leftrightarrow x\le0\)\(\left(1\right)\)

\(\frac{x}{2}+\frac{3-2x}{5}\ge\frac{3x-5}{6}\)

\(\Rightarrow\frac{15x}{30}+\frac{6\left(3-2x\right)}{30}-\frac{5\left(3x-5\right)}{30}\ge0\)

\(\Rightarrow15x+18-12x-15x+25\ge0\)

\(\Rightarrow-12x\ge-43\)\(\Rightarrow12x\le43\Leftrightarrow x\le\frac{43}{12}\)\(\left(2\right)\)

Từ ( 1 ) và ( 2 ) ta có tập nghiệm chung của cả hai phương trình là \(x\le0\)

\(a,3^x>\dfrac{1}{243}\\ \Leftrightarrow3^x>3^{-5}\\ \Leftrightarrow x>-5\\ b,\left(\dfrac{2}{3}\right)^{3x-7}\le\dfrac{3}{2}\\ \Leftrightarrow3x-7\le1\\ \Leftrightarrow3x\le8\\ \Leftrightarrow x\le\dfrac{8}{3}\\ c,4^{x+3}\ge32^x\\ \Leftrightarrow2^{2x+6}\ge2^{5x}\\ \Leftrightarrow2x+6\ge5x\\ \Leftrightarrow3x\le6\\ \Leftrightarrow x\le2\)

d, Điều kiện: x > 1

\(log\left(x-1\right)< 0\\ \Leftrightarrow x-1< 1\\ \Leftrightarrow1< x< 2\)

e, Điều kiện: \(x>\dfrac{1}{2}\)

\(log_{\dfrac{1}{5}}\left(2x-1\right)\ge log_{\dfrac{1}{5}}\left(x+3\right)\\ \Leftrightarrow2x-1\ge x+3\\ \Leftrightarrow x\ge4\)

f, Điều kiện: x > 4

\(ln\left(x+3\right)\ge ln\left(2x-8\right)\\ \Leftrightarrow x+3\ge2x-8\\\Leftrightarrow4< x\le11\)

b, \(\frac{3x-2}{5}\ge\frac{x+1,6}{2}\)

=> \(6x-4\ge5x+8\)

=> \(x-12\ge0\)

=> \(x\ge12\)

bpt 2: \(\frac{6-2x+5}{6}>\frac{3-x}{4}\)

=> \(\frac{11-2x}{6}>\frac{3-x}{4}\)

=> \(44-8x>18-6x\)

=> \(x< 13\)

Vậy để t/m cả 2 bpt thì : \(12\le x< 13\)

a, \(\frac{x^2+x^2-4}{x\left(x-2\right)}>2\) (Đk : \(x\ne\left(0;2\right)\))

=> \(2x^2-4>2x^2-4x\)

=> \(4x-4=4\left(x-1\right)>0\)

=> \(x>1\)(t/m) 

\(\frac{25x-655}{95}-\frac{5\left(x-12\right)}{209}=\frac{89-3x-\frac{2\left(x-18\right)}{5}}{11}\)

\(< =>\frac{5x-131}{19}=\frac{1631-52x-\frac{38x-684}{5}}{209}\)

\(< =>\left(5x-131\right)209=\left(1631-52x-\frac{38x-684}{5}\right)19\)

\(< =>55x-1441=1631-52x-\frac{38x-684}{5}\)

\(< =>3072-107x=\frac{38x-684}{5}\)

\(< =>\left(3072-107x\right)5=38x-684\)

\(< =>15360-535x-38x-684=0\)

\(< =>14676=573x< =>x=\frac{14676}{573}=\frac{4892}{191}\)

nghệm xấu thế 

\(\frac{8\left(x+22\right)}{45}-\frac{7x+149+\frac{6\left(x+12\right)}{5}}{9}=\frac{x+35+\frac{2\left(x+50\right)}{9}}{5}\)

\(< =>\frac{8x+176}{45}-\frac{41x+817}{45}=\frac{11x+415}{45}\)

\(< =>993-33x-11x-415=0\)

\(< =>578=44x< =>x=\frac{289}{22}\)

Bài 1: 

b) Phương trình đã cho tương đương với phương trình:

\(\frac{8\left(x+22\right)-55\left(7x+149\right)-6\left(x+12\right)}{45}=\frac{9\left(x+35\right)+2\left(x+50\right)}{45}\)

\(\Leftrightarrow44x=-1056\)

\(\Leftrightarrow x=-24\)

Vậy x=-24 là nghiệm của phương trình

c) Phương trình đã cho tương đương với phương trình:

\(\frac{3x+6}{70}-\frac{x+4}{24}=\frac{32x+19}{60}+\frac{2}{3}\)

\(\Leftrightarrow12\left(3x+6\right)-35\left(x+4\right)=14\left(32x+19\right)+560\)

\(\Leftrightarrow-447x=894\)

\(\Leftrightarrow x=-2\)

Vậy x=-2 là nghiệm của phương trình