\(a,-12.\left(x-5\right)+7.\left(-x+3\right)=5\)

                  \(-12x+60-7x+21=5\)

                                        \(-19x+81=5\)

                                                   \(-19x=5-81\)

                                                   \(-19x=-76\)

                                                            \(x=4\)

\(b,30.\left(x+2\right)-6.\left(x-5\right)-24.x=100\)

             \(30x+60-6x+30-24x=100\)

                                                  \(0x+90=100\)

                                                             \(0x=100-90\)

                                                             \(0x=10\)

=> ko có giá trị nào thõa mãn x 

cong chua xinh xan oi,cam on nhieu nha

x-4=o hoặc 6-x=0 =>x=4 hoặc x=6

+ ) \(\left(x-4\right)\left(6-x\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-4=0\\6-x=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=4\\x=6\end{cases}}\)

+ ) \(\left(2x-1\right)^2=25\)

       \(\left(2x-1\right)^2=5^2\)Hoặc \(\left(2x-1\right)^2=\left(-5\right)^2\)

 \(\Rightarrow\orbr{\begin{cases}2x-1=5\\2x-1=-5\end{cases}\Rightarrow\orbr{\begin{cases}2x=6\\2x=-4\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=-2\end{cases}}}\)

+ ) \(\left(x\div6\right)^5=243\)

     \(\left(x\div6\right)^5=3^5\)

\(\Rightarrow x\div6=3\)

\(\Leftrightarrow x=18\)

\(\left(x-4\right)\left(6-x\right)=0\)

Th1:\(x-4=0\Rightarrow x=4\)

Th2: \(6-x=0\Rightarrow x=6\)

\(\Rightarrow S=\left\{4;6\right\}\)

\(\left(2x-1\right)^2=25\)

\(\left(2x-1\right)^2=5^2\)

\(2x-1=5\)

\(2x=6\)

\(x=3\)

\(\Rightarrow S=\left\{3\right\}\)

\(\left(\frac{x}{6}\right)^5=243\)

\(\left(\frac{x}{6}\right)^5=3^5\)

\(\frac{x}{6}=3\)

\(x=3\cdot6=18\)

\(\Rightarrow S=\left\{18\right\}\)

\(\left(2x-5\right)^3=8\)

\(\left(2x-5\right)^3=2^3\)

\(2x-5=2\)

\(2x=7\)

\(x=\frac{7}{2}\)

\(b,6⋮x-1\)

\(\Rightarrow x-1\inƯ6\left(\pm1,\pm2,\pm3\right)\)

+ x-1 =1 => x=2

+ x-1 =-1 =>x=0

+ x-1=2 =>x=3

+ x-1=-2 => x= -1

+ x-1 =3 =>x=4

+ x-1=-3 => x=-2

#Giải :

( 2x - 5 )³ = 8

( 2x - 5 )³ = 2³

=> 2x - 5 = 2

     2x = 7

       x = 7/2

6 chia hết cho ( x - 1 )

=> (x - 1) € Ư (6)

Ư (6) = { 1 ; 2 ; 3 ; 6 }

Nếu x - 1 = 1 => x = 2

Nếu x - 1 = 2 => x = 3

Nếu x - 1 = 3 => x = 4

Nếu x - 1 = 6 => x = 7

   [ P/S : € - thuộc ]

       #By_Ami 

a) (2x-5)³=8

    (2x-5)³=2³

     2x-5   =2

     2x       =2+5

     2x       =7

       x       =7/2

b) \(6⋮\left(x-1\right)\)

\(\Rightarrow x-1\inƯ\left(6\right)\)

\(\Rightarrow x-1\in\left\{-1;-2;-3;-6;1;2;3;6\right\}\)

\(\Rightarrow x\in\left\{0;-1;-2;-5;2;3;4;7\right\}\)

     Hok tốt nha!!!

\(6x+x=7^{34}\div7^{31}\)

\(x\left(6+1\right)=7^3\)

\(7x=7^3\)

\(x=7^2\)

\(x=49\)

6*x+x=7^34:7^31

x*(6+1)=7^3

x*7=7^3

x=7^3:7

x=7^2

x=49

Vậy x=49

\(6x+x=7^{34}:7^{31}\)

\(\Rightarrow7x=7^3\)

\(\Rightarrow x=7^3:7\)

\(\Rightarrow x=7^2=49\)

Vậy x = 49

Chúc em học tốt nhé!

=> x . 3,6=27 . -2

=>x . 3,6=-54

=>x=-15

=>x.36=27.-2

=> x.3.6=-54

=> x=-15

x^=27

( 7 . x - 11)\(^3\)=2\(^5\). 2\(^2\)+ 200

( 7 . x - 11)\(^3\)=32 . 4  + 200

( 7. x - 11)\(^3\)=328

( 7 . x - 1331) = 328

7 . x                = 328 + 1331

7.x                  = 1659

 x                   = 1659 : 7

x                    = 237

(7x-11)³=2⁵.2²+200

(7x-11)³=2⁷+200

(7x-11)³=128+200

(7x-11)³=328

vô lí vì \(328\ne?^?\)được

vậy x\(\notin\varnothing\)

( 7 . x - 11 )³ = 2⁵ . 2² + 200

( 7 . x - 11 )³ =  128 +200

( 7 x - 11)³ = 328

a)\(-2\left(x+6\right)+6\left(x-10\right)=8.\)

\(\Leftrightarrow-2x-12+6x-60=8\)

\(\Leftrightarrow4x=80\)

\(\Rightarrow x=20\)

b/ \(-4\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)

\(\Leftrightarrow-8x-36+8x-3-x-13=0\)

\(\Leftrightarrow-x=52\)

\(\Rightarrow x=-52\)

c/\(7x\left(2+x\right)-7x\left(x+3\right)=14\)

\(\Leftrightarrow14x+7x^2-7x^2-21x=14\)

\(\Leftrightarrow-7x=14\)

\(\Rightarrow x=-2\)

minh cma on nha

3x+17=2⁸.2³

3x+17=2¹¹

3x+17=2048

3x=2048-17

3x=2031

x=2031:3

x=677

Vậy x=677

3x + 17 = 2⁸.2³
3x + 17 = 2⁸⁺³
3x + 17 = 2¹¹
3x + 17 = 2048
3x         = 2048 - 17
3x         = 2031
  x         = 2031 : 3
  x         = 677
Vậy x = 677

3x + 17 = 2⁸ × 2³

<=>  3x+17= 2⁸⁺³=2¹¹ =2048

<=> 3x=2048-17=2031

<=>x=2031:3=677

Vậy x = 677

♡♡♡♡♡♡♡