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\(\frac{8}{3}:x=\frac{16}{9}:\frac{8}{3}\)
\(\frac{8}{3}:x=\frac{16}{9}.\frac{3}{8}\)
\(\frac{8}{3}:x=\frac{2}{3}\)
\(x=\frac{8}{3}:\frac{2}{3}\)
\(x=\frac{8}{3}.\frac{3}{2}\)
\(x=4\)
Vậy x = 4
\(a,\left(x+2\right)^{10}+\left(x+2\right)^8=0\\ \Leftrightarrow\left(x+2\right)^8\left[\left(x+2\right)^2+1\right]=0\\ \Leftrightarrow\left[{}\begin{matrix}\left(x+2\right)^8=0\\\left(x+2\right)^2+1=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x+2=0\\\left(x+2\right)^2=-1\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-2\\x\in\varnothing\end{matrix}\right.\\ b,\left(x+3\right)^{10}-\left(x+3\right)^8=0\\ \Leftrightarrow\left(x+3\right)^8\left[\left(x+3\right)^2-1\right]=0\\ \Leftrightarrow\left[{}\begin{matrix}\left(x+3\right)^8=0\\\left(x+3\right)^2-1=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x+3=0\\\left(x+3\right)^2=1\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-3\\x+3=1\\x+3=-1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-3\\x=-2\\x=-4\end{matrix}\right.\)
a) => x - 8 = 0 hoặc x3 + 8 = 0
+) x - 8 = 0 => x = 8
+) x3 + 8 = 0 => x3 = - 8 = (-2)3 => x = -2
Vậy x = 8; -2
b) => 4x - 3 - x - 5 = 30 - 3x
=> 3x - 8 = 30 - 3x
=> 3x + 3x = 30 + 8
=> 6x = 38 => x = 38/6 = 19/3
Vậy x = 19/3
a) => x - 8 = 0 hoặc x3 + 8 = 0
+) x - 8 = 0 => x = 8
+) x3 + 8 = 0 => x3 = - 8 = (-2)3 => x = -2
Vậy x = 8; -2
b) => 4x - 3 - x - 5 = 30 - 3x
=> 3x - 8 = 30 - 3x
=> 3x + 3x = 30 + 8
=> 6x = 38 => x = 38/6 = 19/3
Vậy x = 19/3
Bài 1:
a) \(=\dfrac{8}{15}\left(\dfrac{7}{13}+\dfrac{6}{13}\right)=\dfrac{8}{15}.1=\dfrac{8}{15}\)
b) \(=\dfrac{3.3-7-2.4}{12}=-\dfrac{6}{12}=-\dfrac{1}{2}\)
Bài 2:
\(\dfrac{x}{2,7}=-\dfrac{2}{3,6}\Rightarrow x=\dfrac{\left(-2\right).2,7}{3,6}\Rightarrow x=-\dfrac{3}{2}\)
Bài 3:
\(\dfrac{x}{2}=\dfrac{y}{5}=\dfrac{x+y}{2+5}=-\dfrac{21}{7}=-3\)
\(\Rightarrow\left\{{}\begin{matrix}x=\left(-3\right).2=-6\\y=\left(-3\right).5=-10\end{matrix}\right.\)
a)(x-8)(x3+8)=0
<=>x-8=0 hoặc x3+8=0
<=>x=8 hoặc x3=-8
<=>x=8 hoặc x=-2
b)(4x-3)-(x+5)=3(10-x)
<=>4x-3-x-5=30-3x
<=>(4x-x)+(-3-5)=30-3x
<=>3x-8=30-3x
<=>6x=38
<=>x=\(\frac{38}{6}=\frac{19}{3}\)
\(\dfrac{x}{6}=\dfrac{8}{3}\)
\(\Rightarrow x=\dfrac{8.6}{3}=16\)
\(\frac{x+3}{-8}=\frac{-18}{x+3}\Leftrightarrow\left(x+3\right)\left(x+3\right)=\left(-18\right).\left(-8\right)=144\)
\(\Rightarrow\left(x+3\right)^2=144=12^2\Leftrightarrow x+3=12\)
\(\Rightarrow x=12-3=9\) Vậy \(x=9\)
Ta có: \(\frac{x+3}{-8}=\frac{-18}{x+3}\)
\(\Rightarrow\left(x+3\right).\left(x+3\right)=-18.\left(-8\right)\)
\(\Rightarrow\left(x+3\right)^2=144\)
\(\Rightarrow\left(x+3\right)^2=\left(\pm12\right)^2\)
\(\Rightarrow\orbr{\begin{cases}x+3=12\\x+3=-12\end{cases}\Rightarrow\orbr{\begin{cases}x=9\\x=-15\end{cases}}}\)
\(\Rightarrow x\in\left\{-15;9\right\}\)
_Học tốt-.-_
<=>(1.2x)^3=(-2)^3
<=>1.2x=-2
<=>2x=-2
<=>x=-2:2
<=>x=-1
Vậy x=-1
<3 <3