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\(3\left(x-2\right)+4\left(x-5\right)=23\)
\(\Rightarrow3x-6+4x-20-23=0\)
\(\Rightarrow7x-49=0\)
\(\Rightarrow x=7\)
3(x-2)+4(x-5)=23
<=>3x-6+4x-20=23
<=>7x-26=23
<=>7x=49
<=>x=7
Vậy x=7
![](https://rs.olm.vn/images/avt/0.png?1311)
a,(2x+7)+135=0 b, 1/2x-2/5=1/5
2x+7=0-135 1/2x=1/5+2/5
2x+7=-135 1/2x=3/5
2x=-135-7 x=3/5:1/2
2x=-142 x=6/5
x=-142:2 Vậy x=6/5
x=-71
Vậy x=-71
c, 10-|x+1|=5 d, 1/2x+150%x=2014
|x+1|=10-5 2x=2014
|x+1|=5 x=2014:2
*TH1:x+1=5 *TH2:x+1=-5 x=1007
x=5-1 x=-5-1 Vậy x=1007
x=4 x=-6
Vậy x=4 hoặc x=-6
![](https://rs.olm.vn/images/avt/0.png?1311)
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a, \(x\) + (\(x\) + 1) + (\(x\) + 3) = 153
\(x\) + \(x\) + 1 + \(x\) + 3 = 153
3\(x\) + 4 = 153
3\(x\) = 153 - 4
3\(x\) = 149
\(x\) = 149 : 3
\(x\) = \(\dfrac{149}{3}\)
b, (\(2x-7\)) - (\(x\) + 135) =0
2\(x\) - 7 - \(x\) - 135 = 0
\(x\) - 142 = 0
\(x\) = 142
![](https://rs.olm.vn/images/avt/0.png?1311)
a)10-Ix+1I=5
Ix+1I=10-5
Ix+1I=5=>x+1=+-5
TH1:x+1=5 TH2:x+1=-5
=>x=4 =>x=-6
b)(2.x+7)+135=0
2.x+7=0-135
2.x+7=-135
2.x=-135-7
2.x=-142
x=-142:2
x=-71
c)1/2x-2/5=1/5
1/2x=1/5+2/5
1/2x=3/5
x=3/5:1/2
x=6/5
d)1/2x+150%x=2014
1/2x+15/10x=2014
x.(1/2+15/10)=2014
x.2=2014
x=2014:2
x=1007
mình trả lời cho cậu rồi nhớ nha
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Lời giải:
1. $(x+2)-2=0$
$x+2=2$
$x=0$
2.
$(x+3)+1=7$
$x+3=7-1=6$
$x=6-3=3$
3.
$(3x-4)+4=12$
$3x-4+4=12$
$3x=12$
$x=12:3=4$
4.
$(5x+4)-1=13$
$5x+4=13+1=14$
$5x=14-4=10$
$x=10:5=2$
5.
$(4x-8)-3=5$
$4x-8=5+3=8$
$4x=8+8=16$
$x=16:4=4$
6.
$3+(x-5)=7$
$x-5=7-3=4$
$x=4+5=9$
7.
$8-(2x-4)=2$
$2x-4=8-2=6$
$2x=6+4=10$
$x=10:2=5$
8.
$7+(5x+2)=14$
$5x+2=14-7=7$
$5x=7-2=5$
$x=5:5=1$
9.
$5-(3x-11)=1$
$3x-11=5-1=4$
$3x=11+4=15$
$x=15:3=5$
10.
$16-(8x+2)=6$
$8x+2=16-6=10$
$8x=10-2=8$
$x=8:8=1$
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(2x+7\right)+135=0\)
\(\Rightarrow2x+7=-135\)
\(\Rightarrow2x=-135-7\)
\(\Rightarrow2x=-142\)
\(\Rightarrow x=-142:2\)
\(\Rightarrow x=-71\)
Vậy x = -71
b) \(\left(-2\right)^4+\left(x-3\right)=\left(15-79\right)^0\)
\(\Rightarrow16+\left(x-3\right)=\left(-64\right)^0\)
\(\Rightarrow16+\left(x-3\right)=1\)
\(\Rightarrow x-3=1-16\)
\(\Rightarrow x-3=-15\)
\(\Rightarrow x=-15+3\)
\(\Rightarrow x=-12\)
Vậy x = -12
c) \(\left(2x-1\right)-3^2=4^3\)
\(\Rightarrow\left(2x-1\right)-9=64\)
\(\Rightarrow2x-1=64+9\)
\(\Rightarrow2x-1=73\)
\(\Rightarrow2x=73+1\)
\(\Rightarrow2x=74\)
\(\Rightarrow x=74:2\)
\(\Rightarrow x=37\)
Vậy x = 37
_Chúc bạn học tốt_
a) (2x+7)+135=0
2x + 7 = -135
2x = -135-7
2x = -142
x = -71
b) (-2)4+(x-3)=(15-79)0
16 + (x-3) = 1
16 + x - 3 = 1
16-3 +x = 1
13 + x = 1
x = -12
c) (2x-1) - 32=43
(2x-1) - 9 = 64
2x - 1 - 9 = 64
2x - 10 = 64
2x = 74
x = 37
3 - 2(2x + 7) = -135
2( 2x + 7 ) = 3 - (-135) = 3 + 135
2( 2x + 7 ) = 138
2x + 7 = 138 : 2
2x + 7 = 69
2x = 69- 7 = 62
x = 62 : 2
x = 31
3-2(2x + 7) = -135
trả lời :
3-2(2x + 7) = -135
=>x=31