4800 : 8 x 4 = 2400

ĐK: ` x\ne 0; x \ne -100`

`4800/x-4800/(x+100)=8`

`<=>1/x-1/(x+100) =1/600`

`<=> (x+100-x)/(x(x+100) = 1/600`

`<=> 100/(x(x+100))=1/600`

`<=> x^2+100x = 60000`

\(\left[{}\begin{matrix}x=200\\x=-300\end{matrix}\right.\)

Vậy...

`4800/x-4800/(x+10)=8`

`ĐK:x ne 0,x ne -10`

`pt<=>600/x-600/(x+10)=1`

`<=>(600x+6000-600x)/(x^2+10x)=1`

`<=>6000/(x^2+10x)=1`

`<=>x^2+10x=6000`

`<=>x^2+10x-6000=0`

`Delta'=25+6000=6025`

`<=>x_1=20,x_2=-30`

3000 x 2 : 3 = 2000

4800 : 8 x 4 = 2400

4000 : 5 : 2 = 400

Kết quả là 1200,075 . 

Nhớ chấm là đúng cho tui :))

4800 * 3/4= 3600

4800 x3/4=3600

xx=192                                                                                                                                                                                                                      x=71       

a)4800 : ( X x 16 ) = 25 

X x 16 = 4800 : 25

X x 16 = 192

X = 192 : 16

X = 12 

b)2009 : ( 71 : x ) = 2009

71 : x = 2009 : 2009

71 : x = 1

x = 71 : 1

x = 71

Hok tốt

\(a)\)\(4800\div\left(x\times16\right)=25\)

\(\Leftrightarrow\)\(\left(x\times16\right)=4800\div25\)

\(\Leftrightarrow\)\(x\times16=192\)

\(\Leftrightarrow\)\(x=192\div16\)

\(\Leftrightarrow\)\(x=12\)

\(b)\)\(2009\div\left(71\div x\right)=2009\)

\(\Leftrightarrow\)\(\left(71\div x\right)=2009\div2009\)

\(\Leftrightarrow\)\(71\div x=1\)

\(\Leftrightarrow\)\(x=71\div1\)

\(\Leftrightarrow\)\(x=71\)

\(4800:x+\frac{130}{4}+255=7,3\times50\)

\(4800:x+\frac{130}{4}+\frac{255\times4}{4}=365\)

\(4800:x+\frac{130}{4}+\frac{1020}{4}=365\)

\(4800:x+\frac{130+1020}{4}=365\)

\(4800:x+\frac{1150}{4}=365\)

\(4800:x+\frac{575}{2}=365\)

\(4800:x=365-\frac{575}{2}\)

\(4800:x=\frac{365\times2}{2}-\frac{575}{2}\)

\(4800:x=\frac{730}{2}-\frac{575}{2}\)

\(4800:x=\frac{730-575}{2}\)

\(4800:x=\frac{155}{2}\)

\(x=4800:\frac{155}{2}\)

\(x=\frac{1920}{31}\)

Chúc Em Học Tốt !

giải hộ em bài nữa nha :X/27=3/X

\(\frac{x}{27}=\frac{3}{x}\)

\(x\times x=27\times3\)

\(x^2=81\)

\(x=\sqrt{81}\)

\(x=9\)

4800:X+130/4+225=7,3x50\(\Rightarrow\)4800:x+130/4=110\(\Rightarrow\)x=4800:(110-130/4)\(\Rightarrow\)x=1920/31