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\(\dfrac{1}{3}x+\dfrac{2}{3}\left(x-1\right)=0\\ \dfrac{1}{3}x+\dfrac{2}{3}x-\dfrac{2}{3}=0\\ x=\dfrac{2}{3}\)
Ý là đề vầy chứ gì:
\(5^x.5^{x+1}.5^{x+2}=10^{18}:2^{18}\)
⇔\(5^{3x+3}=5^{18}\)
⇔\(3x+3=18\)
⇔\(x=5\)
Vậy x=5
a: (x-1)(x+2)(-x-3)=0
=>(x-1)(x+2)(x+3)=0
=>\(\left[{}\begin{matrix}x-1=0\\x+2=0\\x+3=0\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=1\\x=-2\\x=-3\end{matrix}\right.\)
b: (x-7)(x+3)<0
TH1: \(\left\{{}\begin{matrix}x-7>0\\x+3< 0\end{matrix}\right.\)
=>\(\left\{{}\begin{matrix}x>7\\x< -3\end{matrix}\right.\)
=>\(x\in\varnothing\)
TH2: \(\left\{{}\begin{matrix}x-7< 0\\x+3>0\end{matrix}\right.\)
=>\(\left\{{}\begin{matrix}x< 7\\x>-3\end{matrix}\right.\)
=>-3<x<7
mà x nguyên
nên \(x\in\left\{-2;-1;0;1;2;3;4;5;6\right\}\)
1).( 27,56 x 35 ) + ( 27,56 x 67 ) - ( 27,56 x 2)
= (964 + 1846,52) - 55,12
=2810,52 - 55,12
= 2755,4
2).( 4x 35 ) x ( 25 x 5 ) x 2
= ( 140 x 125 ) x2
= 17500 x 2
=35000
4). 3/10
5). 1188
6). 61/6
b) 35 - 5 * x = 20
- 5 * x = 20 - 35
-5 * x = -15
x = \(\frac{-15}{-5}\)
x = \(\frac{15}{5}\)
x = 3
\(\frac{4}{5}xX-\frac{1}{2}=\frac{1}{15}xX+35\%\)
\(\frac{4}{5}xX-0,5=\frac{1}{15}xX+0,35\)
\(\frac{4}{5}xX-\frac{1}{15}xX=0,35+0,5\)
\(\left(\frac{4}{5}-\frac{1}{15}\right)xX=0,85\)
\(\frac{11}{15}xX=0,85\)
\(X=0,85:\frac{11}{15}\)
\(X=\frac{51}{44}\)
\(\Leftrightarrow5\left(x-1\right)=35\Leftrightarrow x-1=7\Leftrightarrow x=1+7=8\)
5(x-1)-35=0
5(x-1) = 0 + 35
5(x-1) = 35
x - 1 = 35 : 5
x - 1 = 7
x = 7 + 1
x = 8