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a) (10-x)2:3+3=-9
(10-x)2:3=-9-3
(10-x)2:3=-11
(10-x)2=-11.3
(10-x)2=-33
Vô lí vì -33 ko chuyển đc mũ 2
Vậy x e 0
b) |x-6|.7-4=31
|x-6|=(31+4):7
|x-6|=5
\(\Rightarrow\orbr{\begin{cases}x-6=5\Rightarrow5+6=11\\x-6=-5\Rightarrow x=-5+6=1\end{cases}}\)
Vậy.....................................................
a) \(\frac{\left(10-x\right)^2}{3}+3=-9\)
\(\Leftrightarrow\frac{\left(10-x\right)^2}{3}=-12\)
\(\Leftrightarrow\left(10-x\right)^2=-36\)( vô nghiệm vì (10-x)2 \(\ge\)0 với mọi x thuộc Z)
b) |x-6|.7-(-2)2=-8+39
<=> |x-6|.7-4=31
<=> |x-6|.7=35
<=> |x-6|=5
\(\Leftrightarrow\orbr{\begin{cases}x-6=5\\x-6=-5\end{cases}\Leftrightarrow\orbr{\begin{cases}x=11\\x=1\end{cases}}}\)
\(a,0.25x\) - \(\frac{2}{3}x\) =\(1\frac{1}{6}\)
\(\Rightarrow x\cdot\left(0.25-\frac{2}{3}\right)=1\frac{1}{6}\)
\(\Rightarrow x\cdot\frac{-5}{12}=\frac{7}{6}\)
\(\Rightarrow x=\frac{7}{6}:\frac{-5}{12}\)
\(\Rightarrow x=\frac{-14}{5}=-2.8\)
\(a.2.x-138=2^3.3^2\)
\(2.x-138=8.9\)
\(2.x-138=72\)
\(2.x\) \(=72+138\)
\(2.x\) \(=210\)
\(x\) \(=210:2\)
\(x\) \(=105\)
\(b.231-\left(x-6\right)=1339:13\)
\(231-\left(x-6\right)=103\)
\(x-6=231-103\)
\(x-6=128\)
\(x\) \(=128+6\)
\(x\) \(=134\)
\(c.\left[\left(6.x-72\right):2-84\right].28=5628\)
\(\left[\left(6.x-72\right):2-84\right]\) \(=5628:28\)
\(\left(6.x-72\right):2-84\) \(=201\)
\(\left(6.x-72\right):2\) \(=201-84\)
\(\left(6.x-72\right):2\) \(=117\)
\(6.x-72\) \(=117.2\)
\(6.x-72\) \(=234\)
\(6.x\) \(=234+72\)
\(6.x\) \(=306\)
\(x\) \(=306:6\)
\(x\) \(=51\)
mik nè
- a, Do \(\left[3x-15\right]^7=0\)
=> \(3x-15=0\)
=> \(3x=0+15\)
=> \(3x=15\)
=> \(x=15:3\)
=> \(x=5\)
\(\left(3x-5\right)^7=0\)
\(\Rightarrow3x-5=0\)
\(\Rightarrow3x=5\)
\(\Rightarrow x=\frac{5}{3}\)
\(\dfrac{3}{x-5}=\dfrac{-4}{x+2}\)=>3.(x+2)=(x-5).(-4)
=> 3.2+3.x=x.(-4)-(-4).5
=>6+3.x=x.(-4)-(-20)
=>3.x-x.(-4)=20-6
=>3.x-x.(-4)=14
=>x.(3+4)=14(vì 3-(-4)=3+4)
=>x.7=14
=>x=14:7
=>x=2
1. a, => -12x+60+21-7x = 5
=> 81 - 19x = 5
=> 19x = 81 - 5 = 76
=> x = 76 : 19 = 4
Tk mk nha
\(\frac{2}{3}=\frac{x}{6}\)
\(\Leftrightarrow3.x=2.6\)
\(\Leftrightarrow3.x=18\)
\(\Leftrightarrow x=18:3\)
\(\Leftrightarrow x=6\)
\(\frac{2}{3}=\frac{x}{6}\)
\(=>\frac{4}{6}=\frac{x}{6}\)
\(=>x=4\)
\(KL:x=4\)