584 x 2 + 236 x 3 + 324 x 4

= 1168 + 708 + 1296

= 3172

  584 x 2 + 236 x 3 + 324 x 4

= 1168 + 708 + 1296

= 1876 + 1296

= 3172

x=-23 Hoặc x=23

k mình mình k lại

\(\left|x-200\right|\)có 2 trường hợp 

Trường hợp 1 : \(x-200\ge0\)

Biểu thức trở thánh : 

\(x-200+360=0\)

\(\Rightarrow x=-160\)

Trường hợp 2 \(x-200< 0\)

Biểu thức trở thành : 

\(200-x+360=0\)

\(\Rightarrow x=560\)

\(4x+3.\left(1-x\right)=2.\left(x-2\right)\)

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

\(\left(4x-3x\right)+3=2x-4\)

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

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

\(-x=-7\)

\(x=7\)

\(2\left|x-1\right|+3\left(x+2\right)=3^2\)

\(2\left|x-1\right|+3x+6=9\)

\(2\left|x-1\right|=9-3x-6\)

\(2\left|x-1\right|=3-3x\)

\(\left|x-1\right|=\frac{3-3x}{2}\)

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

\(\Rightarrow\orbr{\begin{cases}x=\frac{3-3x}{2}+\frac{2}{2}\\x=\frac{-3+3x}{2}+\frac{2}{2}\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\frac{3-3x+2}{2}\\x=\frac{-3+3x+2}{2}\end{cases}}\)

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

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

\(\Rightarrow\orbr{\begin{cases}5x=5\\x=1\end{cases}}\)

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

1:a) 18/21 + 7 /21 = 25/21

  b)12/5 - 2/1 = 12 /5 - 10/5 =2/5

  c) 72 / 72 = 1

  d)5/3 - 3/8 = 5/8

  e) 1/27 . 4/3 = 4 / 81

24*\(\dfrac{3}{6}\)=12

hết

24 x 3/6 = 12

12

( x + 1 ) + ( x + 2 ) + ( x + 3 ) + .... + ( x + 100 ) = 5750

( x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 100 ) = 5750

     100 chữ số x

100 . x + 5050 = 5750

100 . x = 5750 - 5050

100 . x = 700

x = 700 : 100

x = 7

(x+x+...+x)+(1+2+3+...+100)=5750

100x+5050=5750

100x=5750-5050

100x=700

x=700/100

x=7

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