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\(\left(1,1.x-9\right).\left|\frac{-1}{5}\right|=40\%\)
\(\left(\frac{11}{10}.x-9\right).\frac{1}{5}=\frac{2}{5}\)
\(\frac{11}{10}.x-9=\frac{2}{5}:\frac{1}{5}\)
\(\frac{11}{10}.x-9=2\)
\(\frac{11}{10}.x=2+9\)
\(\frac{11}{10}.x=11\)
\(x=11:\frac{11}{10}\)
\(x=10\)
\(\left(\frac{11}{10}x-9\right)\times\frac{1}{5}=\frac{2}{5}\)
\(\left(\frac{11}{10}x-9\right)=\frac{2}{5}:\frac{1}{5}\)
\(\left(\frac{11}{10}x-9\right)=2\)
\(\frac{11}{10}x=2+9\)
\(\frac{11}{10}x=11\)
\(x=11:\frac{11}{10}=10\)
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
\(a\) \(1000000:x=5\)
\(x=200000\)
\(b\) \(5596.x+1,1:x-5696.x=1,1:x\)
\(x=1\)
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
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
Bài 1:
a) x + \(\frac{1}{9}\) - \(\frac{3}{5}\) = \(\frac{3}{6}\) b) \(\frac{3}{4}\) - x + \(\frac{6}{11}\) = \(\frac{5}{6}\)
x + \(\frac{1}{9}\) = \(\frac{3}{6}\) + \(\frac{3}{5}\) \(\frac{3}{4}\) - x = \(\frac{5}{6}\) - \(\frac{6}{11}\)
x + \(\frac{1}{9}\) = \(\frac{11}{10}\) \(\frac{3}{4}\) - x = \(\frac{19}{66}\)
x = \(\frac{11}{10}\) - \(\frac{1}{9}\) x = \(\frac{19}{66}\) + \(\frac{3}{4}\)
x = \(\frac{89}{90}\) x = \(\frac{137}{132}\)
Bài 2
a) x : 13/16 = 5/8 b)x - 14/28 = 6/9 + 8/25
x = 5/8 * 13/16 x - 14/28 = 74/75
x = 65/128 x = 74/75 + 14/28
x = 223/150
Bài 3
a)62/7 * x = 29/9 : 3/56 b)1/5 : x = 1/5 + 1/7
62/7 * x = 1624/27 1/5 : x = 12/35
x = 1624/27 : 62/7 x = 12/35 * 1/5
x = 5684/637 x = 12/175
Bài 2:
a, |x-1| -x +1=0
|x-1| = 0-1+x
|x-1| = -1 + x
\(\orbr{\begin{cases}x-1=-1+x\\x-1=1-x\end{cases}}\)
\(\orbr{\begin{cases}x=-1+x+1\\x=1-x+1\end{cases}}\)
\(\orbr{\begin{cases}x=x\\x=2-x\end{cases}}\)
x = 2-x
2x = 2
x = 2:2
x=1
b, |2-x| -2 = x
|2-x| = x+2
\(\orbr{\begin{cases}2-x=x+2\\2-x=2-x\end{cases}}\)
2-x = x+2
x+x = 2-2
2x = 0
x = 0
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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
\(x:\left(1,1x-9\right).\frac{1}{5}=40\%\)
\(x:\left(1,1x-9\right)=2\)
\(x=2.\left(1,1x-9\right)\)
\(x=2,2x-18\)
\(-1,2x=-18\)
\(x=15\)
mình cũng vậy