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\(\left(1,1.x-9\right).\left|\frac{-1}{5}\right|=40\%\)
\(\left(\frac{11}{10}.x-9\right).\frac{1}{5}=\frac{2}{5}\)
\(\frac{11}{10}.x-9=\frac{2}{5}:\frac{1}{5}\)
\(\frac{11}{10}.x-9=2\)
\(\frac{11}{10}.x=2+9\)
\(\frac{11}{10}.x=11\)
\(x=11:\frac{11}{10}\)
\(x=10\)
\(\left(\frac{11}{10}x-9\right)\times\frac{1}{5}=\frac{2}{5}\)
\(\left(\frac{11}{10}x-9\right)=\frac{2}{5}:\frac{1}{5}\)
\(\left(\frac{11}{10}x-9\right)=2\)
\(\frac{11}{10}x=2+9\)
\(\frac{11}{10}x=11\)
\(x=11:\frac{11}{10}=10\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a: \(\Leftrightarrow\dfrac{6}{7}\left(\dfrac{7}{12}x-\dfrac{14}{3}\right)=\dfrac{5}{9}-\dfrac{9}{8}=\dfrac{-41}{72}\)
\(\Leftrightarrow x\cdot\dfrac{7}{12}-\dfrac{14}{3}=-\dfrac{287}{432}\)
\(\Leftrightarrow x\cdot\dfrac{7}{12}=\dfrac{1729}{432}\)
hay \(x=\dfrac{247}{36}\)
b: \(\Leftrightarrow\dfrac{1}{5}:x=\dfrac{1}{5}+\dfrac{3}{14}-\dfrac{8}{7}=\dfrac{-51}{70}\)
hay \(x=-\dfrac{14}{51}\)
c: đề sai rồi bạn
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a) Ta có: \(-5x+32=\left(-2\right)^3\)
\(\Leftrightarrow-5x+32=-8\)
\(\Leftrightarrow-5x=-40\)
hay x=8
Vậy: x=8
b) Ta có: \(-2x+36=6\)
\(\Leftrightarrow-2x=6-36=-30\)
hay x=15
Vậy: x=15
e) Ta có: \(\left(x+9\right)\left(x^2-25\right)=0\)
\(\Leftrightarrow\left(x+9\right)\left(x-5\right)\left(x+5\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x+9=0\\x-5=0\\x+5=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-9\\x=5\\x=-5\end{matrix}\right.\)
Vậy: \(x\in\left\{-9;5;-5\right\}\)
b,-2x+36=6
tương đương -2x=-30
tương đương x=15
a, -5x+32=(-2)^3
tương đương -5x+32=8
tương đương -5x=-24
tương đương x=24/5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a\) \(1000000:x=5\)
\(x=200000\)
\(b\) \(5596.x+1,1:x-5696.x=1,1:x\)
\(x=1\)
a) ( 5 876 321 - 999 999 - 3 876 000 - 322 ) : x = 5
=> 1 000 000 : x = 5
=> x = 1 000 000 : 5 = 200 000
Vậy ...
b) ( 7 593 - 1 997 ) . x +1,1/x - 5696x = 1,1/x
=> 7593x + 1,1/x - 5696x - 1,1/x = 0
=> ( 7593x - 5696x ) + (1,1/x-1,1/x) = 0
=> 1897x + 0 = 0
=> 1897x = 0
=> x = 0 : 1897 = 0
Vậy x = 0
![](https://rs.olm.vn/images/avt/0.png?1311)
b: =>2/5*x=2/3+4/5=22/15
=>x=11/3
c: =>2,5-0,25(2-1/2x)=0,25
=>0,25(2-0,5x)=2,25
=>2-0,5x=9
=>-0,5x=-7
=>x=14
d: =>(x-3)^2=36
=>x=9 hoặc x=-3
e: =>1/2x-3/4=0 và x+y=25
=>x=15 và y=10
![](https://rs.olm.vn/images/avt/0.png?1311)
l) (x + 9) . (x2 – 25) = 0
<=> (x + 9) . (x – 5) . (x + 5) = 0
<=> \(\left[{}\begin{matrix}\text{x + 9 = 0}\\x-5=0\\x+5=0\end{matrix}\right.\left[{}\begin{matrix}x=-9\\x=5\\x=-5\end{matrix}\right.\)
Vậy S = \(\left\{-9,5,-5\right\}\)
e) |x - 4 |< 7
<=> \(\left[{}\begin{matrix}x-4=7\\x-4=-7\end{matrix}\right.< =>\left[{}\begin{matrix}x=11\\x=-3\end{matrix}\right.\)
Vậy S = \(\left\{11;-3\right\}\)
I,(x+9).(x^2-25)=0
tương đương:x+9=0
x^2-25=0
tương đương : x=-9
x=5
e,\(\left|x-4\right|\)=7
tương đương x-4=4
x-4=-4
tương đương :x=0
x=-8
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1:
( 2 + 4 + 6 + ... + 40 ) - x = 280
SSH là : ( 40 - 2 ) : 2 + 1 = 20 ( số )
Tổng là : ( 40 + 2 ) . 20 : 2 = 420
=> 420 - x = 280
=> x = 140
P/s : mk làm từng phần một nha
( x + 3 ) + ( x + 5 ) + ( x + 7 ) + ( x + 9 ) = 72
4x + 24 = 72
4x = 48
x = 12
\(x:\left(1,1x-9\right).\frac{1}{5}=40\%\)
\(x:\left(1,1x-9\right)=2\)
\(x=2.\left(1,1x-9\right)\)
\(x=2,2x-18\)
\(-1,2x=-18\)
\(x=15\)
mình cũng vậy