tìm x 4800:(x*4)=8
Tính nhẩm
4800 : 8 x 4 =
\(\dfrac{4800}{x}-\dfrac{4800}{x+100}=8\)
giải pt
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`
Tính nhẩm
3000 x 2 : 3 =
4800 : 8 x 4 =
4000 : 5 : 2 =
3000 x 2 : 3 = 2000
4800 : 8 x 4 = 2400
4000 : 5 : 2 = 400
Tìm x:
4800: (x × 16) = 25
4800: ( x x 16) = 25 x x 16 = 4800 : 25 x x 16 = 192 x = 192 : 16 x = 12 |
4800 x 3 phần 4 = ?
Kết quả là 1200,075 .
Nhớ chấm là đúng cho tui :))
4800 * 3/4= 3600
Tìm x:
a)4800:(xx16)=25
b)2009:(71:x)=2009
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
\(a)\)\(4800\div\left(x\times16\right)=25\)
\(\Leftrightarrow\)\(\left(x\times16\right)=4800\div25\)
\(\Leftrightarrow\)\(x\times16=192\)
\(\Leftrightarrow\)\(x=192\div16\)
\(\Leftrightarrow\)\(x=12\)
\(b)\)\(2009\div\left(71\div x\right)=2009\)
\(\Leftrightarrow\)\(\left(71\div x\right)=2009\div2009\)
\(\Leftrightarrow\)\(71\div x=1\)
\(\Leftrightarrow\)\(x=71\div1\)
\(\Leftrightarrow\)\(x=71\)
a) 4800:X+130/4 + 255= 7.3 x 50
b) X/27=3/X
4800:X+130/4+255=7,3x50
\(4800:x+\frac{130}{4}+255=7,3\times50\)
\(4800:x+\frac{130}{4}+\frac{255\times4}{4}=365\)
\(4800:x+\frac{130}{4}+\frac{1020}{4}=365\)
\(4800:x+\frac{130+1020}{4}=365\)
\(4800:x+\frac{1150}{4}=365\)
\(4800:x+\frac{575}{2}=365\)
\(4800:x=365-\frac{575}{2}\)
\(4800:x=\frac{365\times2}{2}-\frac{575}{2}\)
\(4800:x=\frac{730}{2}-\frac{575}{2}\)
\(4800:x=\frac{730-575}{2}\)
\(4800:x=\frac{155}{2}\)
\(x=4800:\frac{155}{2}\)
\(x=\frac{1920}{31}\)
Chúc Em Học Tốt !
\(\frac{x}{27}=\frac{3}{x}\)
\(x\times x=27\times3\)
\(x^2=81\)
\(x=\sqrt{81}\)
\(x=9\)
a) 4800:X+130/4 + 255= 7.3 x 50
4800:X+130/4+225=7,3x50\(\Rightarrow\)4800:x+130/4=110\(\Rightarrow\)x=4800:(110-130/4)\(\Rightarrow\)x=1920/31