\(\text{a) -3000 : 2 + 5(2x-1) = 125}\\ -1500+5\left(2x-1\right)=125\\ 5\left(2x-1\right)=125-\left(-1500\right)\\ 5\left(2x-1\right)=1625\\ 2x-1=1625:5\\ 2x-1=325\\ 2x=325+1\\ 2x=326\\ x=326:2\\ x=163\)

\(\text{b) 6x -12 = -18}\\ 6x=-16+12\\ 6x=-6\\ x=-1\)

\(\text{c) 17 + 3(x-1) = 5}\\ 3\left(x-1\right)=5-17\\ 3\left(x-1\right)=-12\\ x-1=-12:3\\ x-1=-4\\ x=-3\)

\(a,\\ \left(x+\dfrac{1}{2}\right)^3=\dfrac{8}{125}=\dfrac{2^3}{5^3}\\ \left(x+\dfrac{1}{2}\right)^3=\left(\dfrac{2}{5}\right)^3\\ \Rightarrow\left(x+\dfrac{1}{2}\right)=\dfrac{2}{5}\\ x=\dfrac{2}{5}-\dfrac{1}{2}\\ x=-\dfrac{1}{10}\)

\(b,3\left|x\right|-27=\dfrac{1}{5}\\ 3\left|x\right|=\dfrac{1}{5}+27\\ 3\left|x\right|=\dfrac{136}{5}\\ \left|x\right|=\dfrac{136}{5}:3\\ \left|x\right|=\dfrac{136}{15}\\ Vậy:x=\dfrac{136}{15}.or.x=-\dfrac{136}{15}\)

\(c,\\ \dfrac{1}{2}.\left(x+\dfrac{1}{3}\right)=\dfrac{1}{16}\\ \left(x+\dfrac{1}{3}\right)=\dfrac{1}{16}:\dfrac{1}{2}\\ \left(x+\dfrac{1}{3}\right)=\dfrac{1}{8}\\ x=\dfrac{1}{8}-\dfrac{1}{3}\\ x=-\dfrac{5}{24}\)

5^x=125

=>5^xx=5³

=> x=3

Vậy x=3

3^2x=81

=>3^2x=3⁴

=>2x=4

=>x=4:2=2

Vậy x=2

Tk mk

a, => 5^x = 5^3

=> x = 3

b, => 3^2x = 3^4

=> 2x = 4

=> x = 2

Tk mk nha

a,5^x=125

5^x=5³

=>x=3

b,3^2x=81

3^2x  = 3⁴

=>. 2x = 4

=> x = 4 : 2

=> x = 2

~~ học tốt ~~

a,3x.(2x+3)-(2x+5).(3x-2)=8

x=1

b,5x(x+2)-x.(2x-7)-3x^2=81

x=81/17

~~~~~~~~~~~ai đi ngang qua nhớ để lại k ~~~~~~~~~~~~~

 ~~~~~~~~~~~~ Chúc bạn sớm kiếm được nhiều điểm hỏi đáp ~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~ Và chúc các bạn trả lời câu hỏi này kiếm được nhiều k hơn ~~~~~~~~~~~~

\(a,\Rightarrow3x-1=5\\ \Rightarrow3x=6\\ \Rightarrow x=2\\ b,\Rightarrow15\left(x+1\right)=200-35=165\\ \Rightarrow x+1=11\\ \Rightarrow x=10\\ c,\Rightarrow x\inƯC\left(18,54\right)=Ư\left(18\right)=\left\{1;2;3;6;9;18\right\}\)

a) 5^x = 125

   5³ = 125

Vậy x = 3

b) 3^x = 81

   3⁴ = 81

Vậy x = 4

c)5^2x-3 - 2 . 5² = 5² . 3

5^{2x-3 =} 5² . 3 + 2. 5²

5^2x-3 = 5² . ( 3 + 2 )

5^2x-3 = 5² . 5

5^2x-3 = 5³

=> 2x - 3 = 3

     2x = 6

     x = 3

Vậy x = 3

b . 49x^2 - 81 = 0 

=> 49x^2 = 81 

rồi giải ra nhé 

a ) 2x ( x - 5 ) - x ( 3 + 2x ) = 26

2x² - 10x - 3x - 2x² = 26

- 13x = 26

x = 26 : ( -13 )

x = -2

b) 49x² - 81 = 0

( 7x - 9 )( 7x + 9 ) = 0

Th1 :

7x - 9 = 0

7x = 9

x = \(\frac{9}{7}\)

Th2

7x + 9 = 0

7x = -9

x = \(-\frac{9}{7}\)

Vay x = \(\frac{9}{7}\) hoac x = \(-\frac{9}{7}\)

bn này k bao gio tra cong ng khac, ngu j ma lam