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a) \(\left(x-1\right):3=2^3\) \(\Leftrightarrow\) \(\left(x-1\right):3=8\) \(x+1=24\) \(\Leftrightarrow\) \(x=23\) vậy \(x=23\)
b) \(12-2\left(x+5\right)=-10\) \(\Leftrightarrow\) \(12-2x-10=-10\)
\(\Leftrightarrow\) \(-2x=-12\) \(\Leftrightarrow\) \(x=6\) vậy \(x=6\)
c) \(x-12\left(x+5\right)=-10\) \(\Leftrightarrow\) \(x-12x-60=-10\)
\(\Leftrightarrow\) \(-11x=50\) \(\Leftrightarrow\) \(x=\dfrac{50}{-11}\) vậy \(x=\dfrac{50}{-11}\)
e) \(13-x:2=10\Leftrightarrow-x:2=-3\Leftrightarrow x=\dfrac{3}{2}\)
f) \(\left|12-x\right|-7=5\)
th1 : \(x\le12\) thì \(\left|12-x\right|-7=5\) \(\Leftrightarrow\) \(12-x-7=5\) \(\Leftrightarrow\) \(-x=0\Leftrightarrow x=0\)
th2 : \(x>12\) thì \(\left|12-x\right|-7=5\) \(\Leftrightarrow\) \(x-12-7=5\) \(\Leftrightarrow\) \(x=24\) vậy \(x=0;x=24\)
i) \(x^2-7=2\Leftrightarrow x^2=9\Leftrightarrow x=3\) vậy \(x=3\)
k) \(x^3-4=-12\) \(\Leftrightarrow\) \(x^3=-8\) \(\Leftrightarrow x=-2\) vậy \(x=-2\)
a)\(\left(x-1\right):3=2^3\Rightarrow x-1=2^3.3=24\Rightarrow x=25\)
b)\(12-2\left(x+5\right)=-10\Leftrightarrow12-2x-10=-10\Rightarrow2-2x=-10\Rightarrow2x=12\Rightarrow x=6\)c)\(x-12\left(x+5\right)=-10\Rightarrow x-12x-60=-10\Rightarrow-11x-60=-10\Rightarrow-11x=-70\Rightarrow x=\dfrac{70}{-11}\)d)\(6-\left|x\right|=5\Rightarrow\left|x\right|=1\Rightarrow x=\left\{\pm1\right\}\)
Làm nốt nha
\(\frac{5}{12}+\frac{-7}{12}:x=-\frac{3}{10}\)
\(\Rightarrow\frac{-7}{12}:x=\frac{-3}{10}-\frac{5}{12}\)
\(\Rightarrow\frac{-7}{12}:x=\frac{-43}{60}\)
\(\Rightarrow x=\frac{-7}{12}:\frac{-43}{60}\)
\(\Rightarrow x=\frac{35}{43}\)
~Study well~
#Seok_Jin#
5/12+(-7/12):x=-3/10
-7/10:x=-3/10-5/12
-7/10:x=-43/60
x=--7/10:(-43/60)
x=42/43
k cho mk nha
`-5/7xx3/13-5/7xx10/13+12/7`
`=-5/7xx(3/13+10/13)+12/7`
`=-5/7xx13/13+12/7=-5/7+12/7=7/7=1`
\(a,-5.\left(-x+7\right)-3.\left(-x-5\right)=-4.\left(12-x\right)+48\)
\(5x-35-3x+15=-48+4x+48\)
\(2x-10=4x\)
\(2x-4x=10\)
\(-2x=10\)
\(x=-5\)
\(b,\left(-x-7\right)-5.\left(-x-3\right)=12.\left(3-x\right)\)
\(-x-7+5x+15=36-12x\)
\(4x+8=36-12x\)
\(4x+12x=36-8\)
\(16x=28\)
\(x=1,75\)
các câu còn lại tương tự nha
a ) \(-5\times\left(-x+7\right)-3\times\left(-x-5\right)=-4\times\left(12-x\right)+48\)
\(\Leftrightarrow5x-35+3x+15=-48+4x+48\)
\(\Leftrightarrow5x-3x+4x=35-15-48+48\)
\(\Leftrightarrow2x=20\)
\(\Leftrightarrow x=10\)
b ) \(-2\times\left(15-3x\right)-4\times\left(-7x+8\right)=-5-9\times\left(-2x+1\right)\)
\(\Leftrightarrow-30+6x-28x-32=-5+18x-9\)
\(\Leftrightarrow6x-28x-18x=30+32-5-9\)
\(\Leftrightarrow-40x=48\)
\(\Leftrightarrow x=-1.2\)
\(\frac{5}{12}+\left(-\frac{7}{12}\right):x=-\frac{3}{10}\)
\(\Rightarrow-\frac{7}{12}:x=-\frac{43}{60}\)
\(\Rightarrow x=\frac{35}{43}\)
\(\frac{5}{12}+-\frac{7}{12}:x=\frac{-3}{10}\)
\(\Leftrightarrow\)\(-\frac{7}{12}:x=\frac{-3}{10}-\frac{5}{12}\)
\(\Leftrightarrow\)\(-\frac{7}{12}:x=\frac{-18}{60}-\frac{25}{60}\)
\(\Leftrightarrow\)\(-\frac{7}{12}:x=\frac{-43}{60}\)
\(\Leftrightarrow\) \(x=\frac{-7}{12}:\frac{-43}{60}\)
\(\Leftrightarrow\) \(x=\frac{-7}{12}.\frac{60}{-43}\)
\(\Leftrightarrow\) \(x=\frac{35}{43}\)
Vậy \(x=\frac{35}{43}\)