a) x - 306 = 504

x = 504 + 306

x = 810

b) x + 254 = 680

x = 680 - 254

x = 426

x = 5712

Sai đề rồi bạn ơi

Sai đề rồi nha

Nhớ k cho  mình nah

( X +X x 2 ) :34 = 504

X x 3 = 504 x 34 

X x 3 = 17136

X= 17136 :3

X= 5712

`a, 504 : (16-3x)=72`

`<=> 16-3x=7`

`<=>3x=9`

`<=>x=3`

`b,272-(4x+15)=45`

`<=>4x+15=227`

`<=>4x=212`

`<=>x=53`

a: =>16-3x=504:72=7

=>3x=9

=>x=3

b: =>4x+15=272-45=227

=>4x=212

=>x=53

a) 504 : (16 - 3\(\times\)x) = 72

=> 16 - 3\(\times\)x = 7

=> 3\(\times\)x = 9

=> x = 3

d) 272 - (4\(\times\)x + 15) = 45

=> 4\(\times\)x + 15 = 227

=> 4\(\times\)x = 212

=> x = 53

Ta có: 2. x +4.x+8.x=504

=> 14x = 504

=> x = 504 : 14

=> x = 36

tim 3 so co ma ban

/x/=1/3

\(\left|x\right|=\left|-\frac{1}{3}\right|\)

\(\left|x\right|=\frac{1}{3}\)

\(\Rightarrow\text{ }x\in\left\{-\frac{1}{3}\text{ ; }\frac{1}{3}\right\}\)

\(\left|x\right|=\left|-\frac{1}{3}\right|\)

\(\left|x\right|=\frac{1}{3}\)

\(\Rightarrow\orbr{\begin{cases}x=-\frac{1}{3}\\x=\frac{1}{3}\end{cases}}\)

\(\Rightarrow\text{ }x\in\left\{-\frac{1}{3}\text{ ; }3\right\}\)

x = 786

= 14x=504

=504:14

=36

x=36

k minh nha

2x + 4x + 8x = 504

=> 14x = 504

x = 504 : 14

x = 36

Sửa đề : 

\(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{x}+\frac{1}{x\left(x+1\right)}=\frac{504}{1009}\)

\(\Rightarrow\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{x}-\frac{1}{x+1}=\frac{504}{1009}\)

\(\Leftrightarrow\frac{1}{2}-\frac{1}{x+1}=\frac{504}{1009}\)

\(\Leftrightarrow\frac{1}{x+1}=\frac{1}{2}-\frac{504}{1009}\)

\(\Leftrightarrow\frac{1}{x+1}=\frac{1}{2018}\)

\(\Leftrightarrow x=2018-1\)

\(\Leftrightarrow x=2017\)

Vậy ...

Sửa đề  \(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{x\left(x+1\right)}=\frac{504}{1009}\)

\(\Leftrightarrow\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+....+\frac{1}{x}-\frac{1}{x+1}=\frac{504}{1009}\)

\(\Leftrightarrow\frac{1}{2}-\frac{1}{x+1}=\frac{504}{1009}\)

\(\Leftrightarrow\frac{1}{x+1}=\frac{1}{2}-\frac{504}{1009}\)

\(\Leftrightarrow\frac{1}{x+1}=\frac{1}{2018}\)

\(\Leftrightarrow x=2017\)

x = 2017 nha bạn