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( 2x - 15 ) ^5 = ( 2x - 15 ) ^3
=>( 2x - 15 ) ^5 - ( 2x - 15 ) ^3 = 0
=>( 2x - 15 ) ^2 =0
=> 2x-15 = 0
=> x = \(\frac{15}{2}\) =7 \(\frac{1}{2}\)
\(\frac{x-1}{-3}\)=\(\frac{2x+5}{5}\)\(\Rightarrow\)5(x-1)=-3(2x+5)
\(\rightarrow\)5x-5=-6x-15
\(\rightarrow\)5x+6x=5-15
\(\rightarrow\)11x=-10\(\Rightarrow\)x=\(\frac{-10}{11}\)
vậy.........................
a, ( 1+x )^3 = (2x)^3
b, ( x-1 )^2=16
c, (x+1)^2=25
d, 4x^3+15=47
e,(2x-1)^5=x^5
Mn giải nhanh giúp mk vs
a,\(\left(1+x\right)^3=\left(2x\right)^3\)
=>\(1+x=2x\)
=>\(x-2x=-1\)
=>\(-x=-1\)
=>\(x=1\)
vậy \(x=1\)
b,\(\left(x-1\right)^2=16\)
=>\(\left(x-1\right)^2=4^2\)
=>\(x-1=4\)
=>\(x=4+1\)
=>\(x=5\)
Vậy\(x=5\)
c,\(\left(x+1\right)^2=25\)
=>\(\left(x+1\right)^2=5^2\)
=>\(x+1=5\)
=>\(x=5-1\)
=>\(x=4\)
Vậy \(x=4\)
d,\(4x^3+15=47\)
=>\(4x^3=47-15\)
=>\(4x^3=32\)
=>\(x^3=32:4\)
=>\(x^3=8\)
=>\(x^3=2^3\)
=>\(x=2\)
Vậy\(x=2\)
e,\(\left(2x-1\right)^5=x^5\)
=>\(2x-1=x\)
=>\(2x-x=1\)
=>\(x=1\)
Vậy\(x=1\)
ĐÚNG K MÌNH NHA
\(\left(3x-6\right)-\left(2x+3\right)=15\)
\(\Leftrightarrow3x-6-2x-3=15\)
\(\Leftrightarrow x-9=15\)
\(\Leftrightarrow x=15+9\)
\(\Leftrightarrow x=24\)
\(\left(3x-6\right)-\left(2x+3\right)=15\)
\(3x-6-2x-3=15\)
\(x-3=15\)
\(x=18\)
a/(x-5)^4=9x-5)^6\(\Rightarrow\) TH1:x-5=1\(\rightarrow\) x=6
\(\Rightarrow\) TH2:x-5=-1\(\rightarrow\) x=4
\(\Rightarrow\) TH3:x-5=0\(\rightarrow\) x=5
vậy....................
b/(2x-15)^5=(2x-15)^6\(\Rightarrow\) 2x-15=1\(\rightarrow\) 2x=16\(\rightarrow\)x=8
\(\Rightarrow\) 2x-15=0\(\rightarrow\)2x=15\(\rightarrow\)x=7.5
vậy................
a) Có : ( x-5 ) \(^4\) = ( x - 5 ) \(^6\)
\(\Rightarrow\left(x-5\right)^6:\left(x-5\right)^4=1\Rightarrow\left(x-5\right)^2=1\)
\(\Rightarrow x-5=1\) hoặc \(x-5=-1\)
\(\Rightarrow x=1+5\) hoặc \(x=-1+5\)
\(\Rightarrow x=6\) hoặc \(x=4\)
b) \(\left(2x-15\right)^5=\left(2x-15\right)^3\)
\(\Rightarrow\left(2x-15\right)^5:\left(2x-15\right)^3=1\Rightarrow\left(2x-15\right)^2=1\)
\(\Rightarrow2x-15=1\) hoặc \(2x-15=-1\)
\(\Rightarrow2x=16\) hoặc \(2x=14\)
\(\Rightarrow x=8\) hoặc \(x=7\)
-45:5*(-3-2x)=3
=> -9*(-3-2x)=3
=> -9*(-3)-(-9)*2x=3
=> 27-(-18)x=3
=> 27+18x=3
=> 18x=3-27
=> 18x=-24
=> x=-24/18
=> x=(-4)/3
\(-45\div5\times\left(-3-2x\right)=3\)
\(\Rightarrow-45\div\left(-15-10x\right)=3\)
\(\Rightarrow-15-10x=-45\div3\)
\(\Rightarrow-15-10x=-15\)
\(\Rightarrow-10x=-15+15\)
\(\Rightarrow-10x=0\)
\(\Rightarrow x=0\div\left(-10\right)\)
VẬY:\(x=0\)
a) \(x^{20}=x\)
\(\Rightarrow\orbr{\begin{cases}x=0\\x=1\end{cases}}\)
b) \(x^6:x^3=125\)
\(\Leftrightarrow x^{6-3}=125\)
\(\Leftrightarrow x^3=125\)
\(\Leftrightarrow x^3=5^3\)
\(\Leftrightarrow x=5\)
c) \(4x^3+12=120\)
\(\Leftrightarrow4x^3=120-12\)
\(\Leftrightarrow4x^3=108\)
\(\Leftrightarrow x^3=27\)
\(\Leftrightarrow x^3=3^3\)
\(\Leftrightarrow x=3\)
d) \(x^{10}=x^1\)
\(\Leftrightarrow x^{10}=x\)
\(\Rightarrow\orbr{\begin{cases}x=1\\x=0\end{cases}}\)
e) \(\left(2x-15\right)^5=\left(2x-15\right)^3\)
\(\Leftrightarrow\left(2x-15\right)^5-\left(2x-15\right)^3=0\)
\(\Leftrightarrow\left(2x-15\right)^3\left[\left(2x-15\right)^2-1\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(2x-15\right)^3=0\\\left(2x-15\right)^2-1=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}2x-15=0\\\orbr{\begin{cases}2x-15=1\\2x-15=-1\end{cases}}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{15}{2}\\\orbr{\begin{cases}x=8\\x=-7\end{cases}}\end{cases}}\)\(\Rightarrow2x-15=0\)hoặc \(2x-15=1\) hoặc \(2x-15=-1\)
\(\Rightarrow x=\frac{15}{2}\)hoặc \(x=8\)hoặc \(x=7\)
\(\left(2x-5\right)^5=\left(2x-5\right)^3\)
\(\left(2x-5\right)^5-\left(2x-5\right)^3=0\)
\(\left(2x-5\right)^3\left[\left(2x-5\right)^2-1\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(2x-5\right)^3=0\\\left(2x-5\right)^2-1=0\end{cases}}\) \(\Rightarrow\orbr{\begin{cases}2x-5=0\\\left(2x-5\right)^2=1=\left(\pm1\right)^2\end{cases}}\) \(\Rightarrow\orbr{\begin{cases}2x=5\\2x-5=-1\text{ hoặc }2x-5=1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{5}{2}\\2x=4\text{ hoặc }2x=6\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=\frac{5}{2}\\x=2\text{ hoặc }x=3\end{cases}}\)
\(\Rightarrow\text{ }x\in\left\{\frac{5}{2}\text{ ; }2\text{ ; }3\right\}\)
\(\left(2x-5\right)^5=\left(2x-5\right)^3\)
=>\(\left(2x-5\right)^5-\left(2x-5\right)^3=0\)
=>\(\left(2x-5\right)^3.\left\{\left(2x-5\right)^2-1\right\}=0\)
=>\(\orbr{\begin{cases}\left(2x-5\right)^3=0\\\left(2x-5\right)^2-1=0\end{cases}}\)
=>\(\orbr{\begin{cases}2x-5=0\\\left(2x-5\right)^2=1\end{cases}}\)
=>\(x=\left\{\frac{5}{2};3;2\right\}\)\(\orbr{\begin{cases}x=\frac{5}{2}\\\orbr{\begin{cases}2x-5=1\\2x-5=-1\end{cases}}\end{cases}}\)