\(\left(x^2-5\right)\left(x+2\right)+5x=2x^2+17\)

\(\Rightarrow\left(x^3+2x^2-5x-10\right)+5x=2x^2+17\)

\(\Rightarrow x^3+2x^2-5x-10+5x=2x^2+17\)

\(\Rightarrow x^3+2x^2-10=2x^2+17\)

\(\Rightarrow x^3-10=17\)

\(\Rightarrow x^3=17+10=27\)

\(\Rightarrow x^3=3^3\)

\(\Rightarrow x=3\)

(x2−5)(x+2)+5x=2x2+17

⇒(x3+2x2−5x−10)+5x=2x2+17

⇒x3+2x2−5x−10+5x=2x2+17

⇒x3+2x2−10=2x2+17

⇒x3−10=17

⇒x3=17+10=27

⇒x3=33

⇒x=3

\(x.[\left(-2x\right)^2+5x]=16\)

\(\Rightarrow x.[\left(-4x\right)+5x]=16\)

\(\Rightarrow x.x=16\)

\(\Rightarrow2x=16\Rightarrow x=8\)

Vay \(x=8\)

Link : Hoc24

A = |2x - 5| + 3 - 2x

A = 2x - 5 + 3 - 2x

A = (2x - 2x) + (-5 + 3)

A = -2

B = |x² - 5x + 4| - 4 + 5x - x²

B = x² - 5x + 4 - 4 + 5x - x²

B = (x² - x²) + (-5x + 5x) + (4 - 4)

B = 0

a) 6x(3x +5)-2x(9x-2)=17

6x3x+6x5-2x9x-2x(-2)=17

\(18x^2\)+30x-\(18x^2\)+4x=17

\(18x^2-18x^2\)+ 34x=17

0 +34x=17

x=17:34

x=0.5

b)2x(3x-1)-3x(2x+11)-70=0

2x3x-2x1-3x2x+3x11-70=0

\(6x^2-2x-6x^2+33x-70=0\)

-2x+33x-70=0

31x-70=0

31x=0+70

31x=70

x=\(\frac{70}{31}\)

(trong câu c dấu . của mình là nhân nha)

c)5x(2x-3)-4(8-3x)=2(3+5x)

5x2x-5x3-4.8+4.3x=2.3+2.5x

\(10x^2-15x-32+12x=6+10x\)

\(10x^2-15x+12x-10x=6+32\)

\(10x^2-13x=38\)

tạm thời mình bí chổ này thông cảm nha bạn

\(5x\left(x-2018\right)-x+2018=0\)

\(5x\left(x-2018\right)-\left(x-2018\right)=0\)

\(\left(x-2018\right)\left(5x-1\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-2018=0\\5x-1=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=2018\\x=\frac{1}{5}\end{cases}}\)

Vậy.........

x = 2018

x = 1/5

t i c k nha

\(5x\left(x-2018\right)-x+2018=0\)

\(\Leftrightarrow5x\left(x-2018\right)-\left(x-2018\right)=0\)

\(\Leftrightarrow\left(x-2018\right)\left(5x-1\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-2018=0\\5x-1=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=2018\\x=\frac{1}{5}\end{cases}}\)

2|5x−3|−2x=14 
Xét 5x−3≥0 <=> x≥35
 => 2(5x−3)−2x=14
<=> 10x−6−2x=14
<=> 8x=20
<=> x=208=52 (thoả mãn)
Xét 5x−3<0 => x<35
 => 2(3−5x)−2x=14
<=> 6−10x−2x=14
<=> −12x=8
<=> x=−812=−23 (thoả mãn)

èo... bạn ko viết dấu nhân,mãi mk mới hiểu !!