1)\(4\left(x-5\right)-3\left(x+7\right)=-19\)

2)\(7\left(x-3\right)-5\left(3-x\right)=11x-5\)

3)\(4\left(2-x\right)+4\left(x-3\right)=14\)

4)\(-5\left(2-x\right)+4\left(x-3\right)=10x-15\)

5)\(7\left(x-9\right)-5\left(6-x\right)=-5+11x\)

6)\(-7\left(3x-5\right)+2\left(7x-14\right)=28\)

7)\(4\left(x-5\right)-3\left(x+7\right)=5.\left(-4\right)\)

1. \(\dfrac{5\left(x-1\right)+2}{6}-\dfrac{7x-1}{4}=\dfrac{2\left(2x+1\right)}{7}-5\)

2. \(x-\dfrac{3\left(x+30\right)}{15}-24\dfrac{1}{2}=\dfrac{7x}{10}-\dfrac{2\left(10x+2\right)}{5}\)

3. \(14\dfrac{1}{2}-\dfrac{2\left(x+3\right)}{5}=\dfrac{3x}{2}-\dfrac{2\left(x-7\right)}{3}\)

4. \(\dfrac{x+1}{3}+\dfrac{3\left(2x+1\right)}{4}=\dfrac{2x+3\left(x+1\right)}{6}+\dfrac{7+12x}{12}\)

5. \(\dfrac{3\left(2x-1\right)}{4}-\dfrac{3x+1}{10}+1=\dfrac{2\left(3x+2\right)}{5}\)

6. \(x-\dfrac{3}{17}\left(2x-1\right)=\dfrac{7}{34}\left(1-2x\right)+\dfrac{10x-3}{2}\)

7. \(\dfrac{3\left(x-3\right)}{4}+\dfrac{4x-10,5}{10}=\dfrac{3\left(x+1\right)}{5}+6\)

8. \(\dfrac{2\left(3x+1\right)+1}{4}-5=\dfrac{2\left(3x-1\right)}{5}-\dfrac{3x+2}{10}\)

Giải phương trình:

a) \(x^2-\left(x+3\right)\left(3x+1\right)=9\).

b) \(x^3+4x+5=0\).

c) \(\left(x+14\right)^3-\left(x+12\right)^3=1352\).

d) \(x^3+\left(x-3\right)^3=\left(2x-3\right)^3\).

e) \(x\left(x+1\right)\left(x+2\right)\left(x+3\right)=360\).

f) \(x^3+\left(x-2\right)\left(2x+1\right)=8\).

Bài 11 : Tìm GTNN của của các biểu thức sau :

a ) \(A=\left|x+3\right|+\left|2x-5\right|+\left|x-7\right|.\)

b ) \(B=\left|x+2\right|+\left|3x-4\right|+\left|x-2\right|+5\)

c ) \(M=\left|x+2\right|+\left|x-3\right|\)

d ) \(C=\left|2x+5\right|+\left|2x+1\right|+\left|2x-7\right|+\left|2x-4\right|+4\)

e ) \(D=\left|3x-6\right|+\left|3x-9\right|+\left|3x-12\right|+\left|3x-15\right|+2018\)

Bài 1: Tính:

A=\(\left(-2\right).\left(-3\right)-5.\left|-5\right|+125.\left(\dfrac{-1}{5}\right)^2\)

B=\(\left(-3\right).\left|-7\right|-\left(-4\right).\left|5\right|+\dfrac{1}{3}.\left|-9\right|\)

C=\(\left(-2\right)^3.\left|-3\right|-\dfrac{1}{5}.\left|-25\right|-4.\left|-7\right|+\left(-2\right)^2\)

D=\(\left(-6\right).\left|-3\right|+2.\left|-9\right|-7\left|\left(-2\right)^3\right|+8.\left|-7\right|\)

E=\(\left|-3^2\right|.\left|4\right|-\left|7\right|.8-\left|6\right|.\left|-8\right|-\left|12\right|.\left(\dfrac{1}{2}\right)^2\)

Bài 2: Tìm x:

a)\(12-2\left|3x+2\right|=10\)

b)\(2.\left|5-4x\right|+17=\left(-2\right)^3.\left(-4\right)\)

c)\(\left|3x-5\right|+\left(-3\right)^2.2=12.\left|3x+5\right|+117\)

d)\(4.\left|3-2x\right|+\left(-5\right).\left|4-3x\right|-5=-6\)

e)\(\left|2x-7\right|-2^3.\left|2x-7\right|+15=-5.\left|2x-7\right|+3\)

f)\(\left|x+2\right|+\left|x^2-4\right|=0\)

g)\(\left|3x-9\right|+\left|x^2-9\right|=0\)

h)\(\left|2x-1\right|+\left|x^2-\dfrac{1}{4}\right|=0\)