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![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(-65-\left(x+15\right)+105=0\)
\(-65-\left(x+15\right)=-105\)
\(x+15=-65-\left(-105\right)\)
\(x+15=40\)
\(x=25\)
b) |-6| + (-9) - (x+1) = 7
-3- (x+1) =7
x+1 = -10
x = -11
c)\(\left|5-x\right|+\left(-25+7\right)=-3-\left(-10\right)\)
\(\left|5-x\right|+\left(-18\right)=7\)
\(\left|5-x\right|=25\)
\(\Rightarrow\orbr{\begin{cases}5-x=25\\5-x=-25\end{cases}\Rightarrow\orbr{\begin{cases}x=-20\\x=30\end{cases}}}\)
d) \(28-\left|x+6\right|+\left(-2\right)=0\)
\(28-\left|x+6\right|=2\)
\(\left|x+6\right|=26\)
\(\Rightarrow\orbr{\begin{cases}x+6=26\\x+6=-26\end{cases}\Rightarrow\orbr{\begin{cases}x=20\\x=-32\end{cases}}}\)
e) \(x-\left(13-15\right)=5+\left(10-x\right)-\left(-1\right)\)
\(x+2=5+10-x+1\)
\(x+2=16-x\)
\(x+x=16-2\)
\(2x=14\)
\(x=7\)
f) \(-120-\left(x-5\right)=125\)
\(x-5=-120-125\)
\(x-5=-245\)
\(x=-240\)
g) \(10-\left(-5+2\right)+\left(-9\right)=\left(-20+7\right)-x\)
\(-16=-13-x\)
\(x=-13+16\)
\(x=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
b) x+1/2 =2/3
<=> x=1/6
c) x-5/6 =1/2
<=> x=4/3
d)
TH1: 3x-1 =0 <=> x=1/3
Th2 : x+1/3 =0 <=> x= -1/3
( giữ lời nhé bạn ;P)
![](https://rs.olm.vn/images/avt/0.png?1311)
1. -x+20 = -(-15)-8+13
=> -x=15-8+13-20
=> -x=0
=> x=0
2. -(-10)+x=-13+(-9)+(-6)
=> 10+x=-13-9-6
=> x = -13-9-6-10
=> x = -38
3. 8-(-12)+10=-(-14)-x
=> 8+12+10=14-x
=> x = 14-8-12-10
=> x = -16
4. -(+12)+(-x)-(-3)=5-(-7)
=> -12-x+3=5+7
=> -x=5+7+12-3
=> -x=21
=> x=-21
5. 14-x+(-10)=-(-9)+(+15)
=> 14-x-10=9+15
=> -x=9+15-14+10
=> -x=20
=> x=-20
6. 12-(-17)+(-3)=-5+x
=> 12+17-3+5=x
=> x=31
7. x-(-19)-(+32)=14-(+16)
=> x+19-32=14-16
=> x=14-16+32-19
=> x=11
8. x-|-15|-|7|=-(-9)+|-5|
=> x-15-7=9+5
=> x=9+5+7+15
=> x=36
9. 15-x+17=13-(-21)
=> 15-x+17=13+21
=> -x=13+21-15-17
=> -x=2
=> x=-2
10. -|-5|-(-x)+4=3-(-25)
=> -5+x+4=3+25
=> x=3+25-4+5
=> x=29
![](https://rs.olm.vn/images/avt/0.png?1311)
3 x 8/15 x 12 = 3x8/15 x12 = 24/15 x 12 = 288/15
7 x 25-49/7 x 24+21= 175 - 7 x24 + 21 =4053
2 x (-13) x 9 x 10/(-3) x 4 x (-5) x 26= -26 x 9 x 10 / 1560 = -234 x 1/156 = -3/2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{ x . (x - 3) = 0}\)
\(\Rightarrow\orbr{\begin{cases}x=0\\x-3=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=0\\x=3\end{cases}}\)
vậy_______
1 ) 5 - ( 10 - x ) = 7
10 - x = 5 - 7
10 - x = - 2
x = 10 - ( - 2 )
x = 12
Vậy x = 12
a) \(x.9,1+x.1,9=26,4\)
\(\Rightarrow x.\left(9,1+1,9\right)=26,4\)
\(\Rightarrow x.11=26,4\)
\(\Rightarrow x=\dfrac{26,4}{11}=\dfrac{12}{5}\)
Vậy \(x=\dfrac{12}{5}\)
b) \(x.9,9+x:10=12,5\)
\(\Rightarrow x.9,9+x.\dfrac{1}{10}=12,5\)
\(\Rightarrow x.\left(9,9+\dfrac{1}{10}\right)=12,5\)
\(\Rightarrow x.10=12,5\)
\(\Rightarrow x=\dfrac{12,5}{10}=\dfrac{5}{4}\)
Vậy \(x=\dfrac{5}{4}\)
c) \(x:0,1-x:4-x.0,75=2,25\)
\(\Rightarrow x.\dfrac{1}{0,1}-x.\dfrac{1}{4}-x.0,75=2,25\)
\(\Rightarrow x.10-x.\dfrac{1}{4}-x.0,75=2,25\)
\(\Rightarrow x.\left(10-\dfrac{1}{4}-0,75\right)=2,25\)
\(\Rightarrow x.9=2,25\)
\(\Rightarrow x=\dfrac{2,25}{9}=\dfrac{1}{4}\)
Vậy \(x=\dfrac{1}{4}\)
d) \(x:0,25-x=51,6\)
\(\Rightarrow x.\dfrac{1}{0,25}-x=51,6\)
\(\Rightarrow x.4-x=51,6\)
\(\Rightarrow x.\left(4-1\right)=51,6\)
\(\Rightarrow x.3=51,6\)
\(\Rightarrow x=\dfrac{51,6}{3}=\dfrac{86}{5}\)
Vậy \(x=\dfrac{86}{5}\)
cảm ơn bạn nha