a) 4800:X+130/4 + 255= 7.3 x 50
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\(4800:x+\frac{130}{4}+255=7,3\times50\)
\(4800:x+\frac{130}{4}+\frac{255\times4}{4}=365\)
\(4800:x+\frac{130}{4}+\frac{1020}{4}=365\)
\(4800:x+\frac{130+1020}{4}=365\)
\(4800:x+\frac{1150}{4}=365\)
\(4800:x+\frac{575}{2}=365\)
\(4800:x=365-\frac{575}{2}\)
\(4800:x=\frac{365\times2}{2}-\frac{575}{2}\)
\(4800:x=\frac{730}{2}-\frac{575}{2}\)
\(4800:x=\frac{730-575}{2}\)
\(4800:x=\frac{155}{2}\)
\(x=4800:\frac{155}{2}\)
\(x=\frac{1920}{31}\)
Chúc Em Học Tốt !
a: \(=\dfrac{3}{2}\cdot\dfrac{4}{3}\cdot...\cdot\dfrac{2001}{2000}=\dfrac{2001}{2}\)
b: \(=10.1\left(340+120-270\right)=10.1\cdot190=101\cdot19=1919\)
c: \(=24\%+8\%+59\%+9\%=1\)
a: \(=\dfrac{3}{2}\cdot\dfrac{4}{3}\cdot...\cdot\dfrac{2001}{2000}=\dfrac{2001}{2}\)
b: \(=101\left(34+13-27\right)=101\cdot20=2020\)
c: \(=24\%+8\%+59\%+9\%=1\)
51x - ( 1+2+3+4+....+50) = 255
51x - 1275 = 255
51x = 255 + 1275
51x = 1530
x= 1530 : 51
x =30
x+x-1+x-2+x-3+x-4+...+x-50 = 255
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`
4800:X+130/4+225=7,3x50\(\Rightarrow\)4800:x+130/4=110\(\Rightarrow\)x=4800:(110-130/4)\(\Rightarrow\)x=1920/31