d) 71 + (26 – 3x) : 5 = 75

(26 – 3x) : 5 = 75 – 71

(26 – 3x) : 5 = 4

26 – 3x = 4 . 5

26 – 3x = 20

3x = 26 – 20

3x = 6

x = 6 : 3 = 2

Vậy x = 2

\(\left(26-3x\right):5+71=75\\ \Leftrightarrow\left(26-3x\right):5=4\\ \Leftrightarrow26-3x=20\\ \Leftrightarrow3x=6\\ \Leftrightarrow x=2\)

Vậy x = 2

(26-3x):5=75-71

(26-3x):5=4

(26-3x)=4.5

(26-3x)=20

3x       =26-20

3x       =6

x         =6:3

x         =2

( 26 - 3x ) : 5 = 75 - 71

( 26 - 3x ) : 5 = 4

26 - 3x = 4 x 5

26 - 3x = 20

3x = 26 - 20

3x = 6

x = 6 : 3

x = 2

71 + (26-3x) :5 = 75

=> (26-3x):5 = 75-71

=> (26-3x) : 5 = 4

=> 26-3x=4.5

=> 26-3x=20

=> 3x=26-20

=> 3x=6

=> x=6:3

=> x=2

x = 2 nha bn

k giùm mk nha các bn

>_< học tốt

Lời giải:
a.

$(x-15).27=0$

$x-15=0:27=0$

$x=15+0=15$

b.

$23(42-x)=0$

$42-x=0$

$x=42$

c.

$(9x+2).3=60$

$9x+2=60:3=20$

$9x=18$

$x=2$
d.

$71+(26-3x):5=75$

$(26-3x):5=75-71=4$

$26-3x=4.5=20$

$3x=26-20=6$

$x=6:2=3$

Câu 1:71+(26-3x):5=75

=>(26-3x):5=75-71

=>26-3x=4*5

=>3x=26-20

=>x=6:3

=>x=2

Câu 2:3636:(12x-91)=36

=>12x-91=3636:36

=>12x=101+91

=>x=192:12

=>x=16

Câu 1 :\(71+\left(26-3xX\right):5=75\)

\(\left(26-3xX\right):5=75-71\)

\(\left(26-3xX\right):5=4\)

\(26-3xX=4x5\)

\(26-3xX=20\)

\(3xX=26-20\)

\(3xX=6\)

\(X=6:3\)

\(X=2\)

Câu 2 : \(3636:\left(12xX-91\right)=36\)

\(12xX-91=101\)

\(12xX=101+91\)

\(12xX=192\)

\(X=192:12\)

\(X=16\)

Câu 1:

\(71+\left(26-3x\right):5=75\)

\(\left(26-3x\right):5=75-71\)

\(\left(26-3x\right):5=4\)

\(26-3x=4\times5\)

\(26-3x=20\)

\(3x=26-20\)

\(3x=6\)

\(x=6:3\)

\(x=2\)

Câu 2:

\(3636:\left(12x-91\right)=36\)

\(12x-91=3636:36\)

\(12x-91=101\)

\(12x=101+91\)

\(12x=192\)

\(x=192:12\)

\(x=16\)

a. (9x + 2).3 = 60

<=> 9x + 2 = 20

<=> 9x = 18

<=> x = 2

b. 71 + (26 - 3x):5 = 75

<=> (26 - 3x) : 5 = 4

<=> 26 - 3x = 4/5

<=> 3x = 26 - 4/5 

<=> x = 42/5

c. 2^x = 32

<=> 2^x = 2⁵

<=> x = 5

d. (x - 6)² = 9

<=> x - 6 = 3

<=> x = 9

a) \(\left(9x+2\right)\times3=60\)

\(\Rightarrow9x+2=60:3\)

\(\Rightarrow9x+2=20\)

\(\Rightarrow9x=20-2\)

\(\Rightarrow9x=18\)

\(\Rightarrow x=18:9\)

\(\Rightarrow x=2\)

Vậy x = 2

b) \(71+\left(26-3x\right):5=75\)

\(\Rightarrow\left(26-3x\right):5=75-71\)

\(\Rightarrow\left(26-3x\right):5=4\)

\(\Rightarrow26-3x=4\times5\)

\(\Rightarrow26-3x=20\)

\(\Rightarrow3x=26-20\)

\(\Rightarrow3x=6\)

\(\Rightarrow x=6:3\)

\(\Rightarrow x=2\)

Vậy x = 2

c) \(2^x=32\)

\(\Rightarrow2^x=2^5\)

\(\Rightarrow x=5\)

Vậy x = 5

d) \(\left(x-6\right)^2=9\)

\(\Rightarrow\orbr{\begin{cases}x-6=3\\x-6=-3\end{cases}}\Rightarrow\orbr{\begin{cases}x=9\\x=3\end{cases}}\)

Vậy x = 9 hoặc x = 3

_Chúc bạn học tốt_

a) (9x+2).3=60

       9x+2  = 20

           9x  = 18

             x  = 2

b) 71 + (26-3x) : 5 = 75

   (26 - 3x) : 5         = 4

    26 - 3x                = 20

          3x                  = 26 - 20

            x                 = 6 : 3

            x                  = 2

c) 2^x = 32

   2^x  = 2⁵

     x = 5

d) (x-6)² = 9

   (x-6)²  = 3²

      x - 6 = 3

         x =  9

bao đúng bn nhé

\(\left(26-3x\right):5+71=75\)

\(\left(26-3x\right):5=4\)

\(26-3x=20\)

\(3x=6\)

\(x=2\)

(26-3x):5+71=75

(26-3x):5=4

26-3x=20

3x=6

x=2

<=> (26-3x):5=4

<=> 26-3x=20

<=> 3x=6

<=> x=2

vậy x=2

đc đấy 

nhưng tôi làm xong tc rùi

x = 2 nha , k

bạn có chép sai đầu bài ko