Tìm x
a, (2x - 15) 5 = ( 2x - 15) 3
b, x + ( x + 1 ) + ( x + 2 ) + ... + ( x + 2013) = 2035147
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b: \(\Leftrightarrow\dfrac{x-2}{A}=\dfrac{\left(5x-1\right)\left(x-2\right)}{x^2\left(5x-1\right)+3\left(5x-1\right)}=\dfrac{x-2}{x^2+3}\)
hay \(A=x^2+3\)
thầy ra ko làm lên olm hỏi à?giỏi đó con
mấy bài này dễ mà
a)x=-6
b)8
c)1
d)4
x+(x+1)+(x+2)+...+(x+2013)=2035147
=> x+x+1+x+2+x+3+...+x+2013=2035147
=>2014x+(1+2+3+...+2013)=2035147
=>2014x+2027091=2035147 (tổng trên bạn tự tính nhé mik không ghi cách tính tổng đâu)
=>2014x=2035147-2027091
=> x =8056/2014
=> x = 4
Vậy x = 4
X+(X+1)+(X+2)+(X+3)+(X+4)+...+(X+2013)=2035147
Xx2014+(1+2+3+4+5+...+2013) =2035147
Xx2014+2027091 =2035147
Xx2014 =8056
X =4
a: =>x/27+1=-2/3
=>x/27=-5/3
=>x=-45
b: \(\Leftrightarrow x-4=\dfrac{2}{5}:\dfrac{20}{21}=\dfrac{2}{5}\cdot\dfrac{21}{20}=\dfrac{42}{100}=\dfrac{21}{50}\)
=>x=221/50
c: \(\Leftrightarrow x+\dfrac{2}{3}=\dfrac{4}{60}=\dfrac{1}{15}\)
=>x=1/15-2/3=1/15-10/15=-9/15=-3/5
d: \(\Leftrightarrow x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{15}{14}\cdot\dfrac{21}{20}\)
=>\(x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{3}{2}\cdot\dfrac{3}{4}=\dfrac{1}{5}-\dfrac{9}{8}=\dfrac{-37}{40}\)
=>x=-37/24
e: =>-3/7x=84/45
=>x=-196/45
f: =>11/10x=-2/3
=>x=-20/33
\(x+\left(x+1\right)+...+\left(x+2013\right)=2035147\)
\(\Leftrightarrow2014x+2027091=2035147\)
\(\Leftrightarrow2014x=8056\)
hay x=4
1) PT \(\Leftrightarrow\dfrac{x+3}{15}=\dfrac{4}{15}\) \(\Rightarrow x+3=4\) \(\Rightarrow x=1\)
Vậy ...
2) Mạnh dạn đoán đề là \(\left(2x-5\right)\left(x-3\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}2x-5=0\\x-3=0\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=\dfrac{5}{2}\\x=3\end{matrix}\right.\)
Vậy ...
3) PT \(\Rightarrow3x-4-2x+5=3\)
\(\Rightarrow x=2\)
Vậy ...
4) PT \(\Rightarrow\left[{}\begin{matrix}2x+1=0\\\dfrac{1}{2}x-1=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=2\end{matrix}\right.\)
Vậy ...
3) Ta có: \(\left(3x-4\right)-\left(2x-5\right)=3\)
\(\Leftrightarrow3x-4-2x+5=3\)
\(\Leftrightarrow x+1=3\)
hay x=2
x+(x+1)+(x+2)+.....+(x+2013)=2035147
2014x+(2013+1).2013:2=2035147
=> 2014x+2014.2013:2=2035147
=> 2014x+2007006=2035147
=> x=(2035147-2007006):2014
=> x=28141:2014
=> x= ko chia hết
x + (x + 1) + (x + 2) + ... + (x + 2013) = 2035147
2014x + 2013.2014:2 = 2035147
2014x + 2027091 = 2035147
2014x = 2035147 - 2027091
2014x = 8056
x = 8056/2014 = 4
b, x + (x + 1) + (x + 2) + ..... + (x + 2013) = 2035147
x + (x + x + .... + x) + (1 + 2 + .... + 2013) = 2035147
x + 2013x + 2027091 = 2035147
2014x = 2035147 - 2027091 = 8056
=> x = 8056 : 2014 = 4
a) ( 2x - 15 )5 = ( 2x - 15 )3
( 2x - 15 )5 - ( 2x - 15 )3 = 0
\(\left(2x-15\right)^3.\left[\left(2x-15\right)^2-1\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(2x-15\right)^3=0\\\left(2x-15\right)^2-1=0\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}2x-15=0\\\left(2x-15\right)^2=1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}2x=15\\2x-15=1\text{ hoặc }2x-15=-1\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{15}{2}\\x=8\text{ hoặc }x=7\end{cases}}}\)
b, x + ( x + 1 ) + ( x + 2 ) + ... + ( x + 2013) = 2035147
( x + x + x + ... + x ) + ( 1 + 2 + ... + 2013 ) = 2035147
2014x + 2027091 = 2035147
2014x = 2035147 - 2027091
2014x = 8056
x = 8056 : 2014
x = 4