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a) \(\left|18-2x\right|=18\Rightarrow\orbr{\begin{cases}18-2x=18\\18-2x=-18\end{cases}\Rightarrow\orbr{\begin{cases}2x=0\\2x=36\end{cases}\Rightarrow}\orbr{\begin{cases}x=0\\x=18\end{cases}}}\)
b) \(\left|1-x\right|=1-x\Rightarrow\orbr{\begin{cases}1-x=1-x\\1-x=-\left(1-x\right)=-1+x\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\left\{\mp1;\mp2;...\right\}\\-x-x=-1-1\Rightarrow x=1\end{cases}}\)
Làm từng nãy đã , mỏi tay
a) ta có \(|\)18 - 2x\(|\)=18
=> 18-2x = 18 hoặc 18 -2x=-18
-2x = 0 -2x = -36
x = 0 x = 18
vậy x = 0 hoặc x=18
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a)(-6-18):(-4)
= { (-6) + (-8) } : (-4)
=(-24) : (-4)= (-6)
b)-28.(50-42)-35.(34-62)
= -28.8-35.(-28)
= -28.(8-35)
= -28.(-27)=756
c)-18-(-5)+26
= -18+5+26
= -13+26=13
d)-72.69+31.(-72)
= -72.(69+31)
= -72.100=-7200
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( 3x - 6 ) . 3 = 18
3x - 6 = 18 : 3 = 6
3x = 6 + 6 = 12
x= 4
6x - 5 = 613
6x = 613 + 5 =618
x=103
x-36:18=12
x - 2 = 12
x= 12 + 2
x= 14
\(\left(3x-6\right).3=18\)
\(\Rightarrow3x-6=19:3=6\)
\(\Rightarrow3x=6+6=12\)
\(\Rightarrow x=12:3=4\)
\(6.x-5=613\)
\(\Rightarrow6x=613+ 5=618\)
\(\Rightarrow x=618:6=103\)
\(x-36:18=12\)
\(\Rightarrow x-2=12\)
\(\Rightarrow x=12+2=14\)
Ủng hộ nha m.n ^_^
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a/ \(\frac{x}{-3}=\frac{-12}{x}\)
=> x . x = (-3) . (-12)
=> x2 = 36
=> x = ±6
b/ \(\frac{\left|x-1\right|}{-6}=\frac{-18}{4}\)
=> 4 . |x - 1| = (- 6) . (- 18)
=> 4 . |x - 1| = 108
=> |x - 1| = 27
Có 2 TH xảy ra :
TH1 : x - 1 = 27 => x = 28
TH2 : - (x - 1) = 27 => -x + 1 = 27 => -x = 26 => x = -26
c/ \(\frac{2y}{-3}=\frac{18}{y^2}\)
=> 2y . y2 = 18 . (-3)
=> 2 . y3 = -54
=> y3 = -27
=> y3 = (- 3)3
=> y = -3
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a, -14 - 7 + x = -12
\(\Leftrightarrow-21+x=-12\)
\(\Leftrightarrow x=-12+21\)
\(\Leftrightarrow x=9\)
b, \(x+\left(-15\right)-\left(-6\right)=11\)
\(\Leftrightarrow x-15+6=11\)
\(\Leftrightarrow x-\left(15-6\right)=11\)
\(\Leftrightarrow x-9=11\)
\(\Leftrightarrow x=11+9\)
\(\Leftrightarrow x=20\)
c, \(x-\left[18+\left(-7\right)\right]=15\)
\(\Leftrightarrow x-\left(18-7\right)=15\)
\(\Leftrightarrow x-11=15\)
\(\Leftrightarrow x=15+11\)
\(\Leftrightarrow x=26\)
d, \(-84-\left(-18-6\right)=x+\left(-20\right)\)
\(\Leftrightarrow-84-\left(-24\right)=x+\left(-20\right)\)
\(\Leftrightarrow-84+24=x+\left(-20\right)\)
\(\Leftrightarrow-60=x+\left(-20\right)\)
\(\Leftrightarrow x=-20+60\)
\(\Leftrightarrow x=40\)
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1)\(\dfrac{-3}{6}=\dfrac{x}{-2}=\dfrac{-18}{y}=\dfrac{-z}{24}\)
\(\Rightarrow x=-\dfrac{3}{6}\cdot\left(-2\right)=1\)
\(\Rightarrow y=-18:\dfrac{-3}{6}=36\)
\(\Rightarrow z=-\dfrac{3}{6}\cdot\left(-24\right)=12\)
câu cuối làm tương tự