\(42-3\cdot\left(17-x\right)-3=?\)

7x=28

x=4

bạn nào bít giúp mik vr

\(4x+3x=30-20:10\)

\(4x+3x=30-2\)

\(4x+3x=28\)

\(\left(4+3\right)x=28\)

\(7x=28\)

\(x=28:7\)

\(x=4\)

Vậy \(x=4\)

Chúc cậu học tốt !!!

(3x - 4)¹⁰ - 3 = 1021

(3x - 4)¹⁰ = 1024 = 2¹⁰

=>3x - 4 = 2

3x = 6

x = 2

\(\left(3x-4\right)^{10}-3=1021\)

\(\Rightarrow\orbr{\begin{cases}3x-4=\sqrt[10]{1024}\\3x-4=-\sqrt[10]{1024}\end{cases}}\Rightarrow\orbr{\begin{cases}3x-4=2\\3x-4=-2\end{cases}}\Rightarrow\orbr{\begin{cases}3x=6\\3x=2\end{cases}}\Rightarrow\orbr{\begin{cases}x=2\\x=\frac{2}{3}\end{cases}}\) 

Vậy: \(\orbr{\begin{cases}x=2\\x=\frac{2}{3}\end{cases}}\)

\(10⋮3x+1\Leftrightarrow3x+1\inƯ\left(10\right)\Leftrightarrow3x+1\in\left\{1,2,5,10\right\}\) 

 \(\Leftrightarrow3x\in\left\{0,1,4,9\right\}\)

Ta có: 10 chia hết cho (3x+1) 

=>\(3x+1\)\(\inƯ\left(10\right)=\left\{1;-1;2;-2;5;-5;10;-10\right\}\)

\(\Rightarrow3x\in\left\{0;-2;1;-3;4;-5;9;-11\right\}\)

\(\Rightarrow x\in\left\{0;\frac{-2}{3};\frac{1}{3};-1;\frac{4}{3};\frac{-5}{3};3;\frac{-11}{3}\right\}\)

Mặt khác \(x\in N\)

\(\Rightarrow x\in\left\{0;3\right\}\)

Vậy \(x\in\left\{0;3\right\}\)

 có 10 chia hết cho 3x+1

=> 3x+1 thuộc Ư₍₁₀₎

=> 3x+1 thuộc { -10 ; -5 ; -2 ; -1 ; 1 ; 2 ; 5 ; 10 }

ta có bảng sau :

vậy x thuộc { 0 ; 10 } để 10 chia hết cho 3x+1

a) x+2(3-x)-3(1-x)=9

<=> x+6-2x-3+3x=9

<=> 2x+3=9

<=> 2x=6

<=> x=3

b) (3x+5)-(x-10)+2x=31

<=> 3x+5-x+10+2x=31

<=> 4x+15=31

<=> 4x=16

<=> x=4

a) x+2(3-x)-3(1-x)=9

        x+6-2x-3+3x=9

               x-2x+3x=9-6+3

                       2x=6

                         x=6:2

                         x=3

Vậy x=3

b) (3x+5)-(x-10)+2x=31

     3x+5-x+10+2x=31

     3x-x+2x=31-5-10

              4x=16 

                x=16:4

                x=4

Vậy x=4

a, x + 2(3 - x) - 3( 1 - x) = 9

<=> x + 6 - 2x - 3 + 3x = 9

<=> x - 2x + 3x = 9 - 6 +3 

<=> 2x = 6

<=> x = 3

Vậy_

b, ( 3x + 5) - ( x - 10) + 2x = 31

<=> 3x + 5 - x + 10 + 2x = 31

<=> 3x - x + 2x = 31 - 5 - 10

<=> 4x =16

<=> x = 4

Vậy_

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b: =>3x-3=3

hay x=2

=2

b,Ta có 3x+7:x-2=>3x-6+13:x-2=>3(x-2)+13:x-2=>13:x-2

Vì \(x\in N\Rightarrow x-2\in N\Rightarrow x-2\inƯ\left(13\right)=\left(1,13\right)\Rightarrow x\in\left(3,15\right)\)

(3x − 24).73 = 2.74

3x − 24 = 2.74 : 73

3x − 24 = 2.74 - 1

3x – 16 = 2.7

3x – 16 = 14

3x = 14 + 16

3x = 30

x = 30 : 3

x = 10

Vậy x = 10