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24 tháng 4 2016
2x + 7=0-135
2x + 7=-135
2x=-135-7
2x=-142
x=-142:2
x=-71
1/2x + 3/2x=2014
x(1/2+3/2)=2014
2x=2014
x=2014:2
x=1007
NL
1
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
27 tháng 8 2023
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
JS
12 tháng 12 2017
( 2x - 7) - (x + 135)=0
=> 2x -7 -x +135 =0
=>x +128 =0
=>x = - 128
LP
4
17 tháng 7 2015
(2x-7)-135=0
2x-7=0+135
2x-7=135
2x=135+7
2x=142
x=142:2
x=71
vậy x=71
b)122+(37-3x)=0
37-3x=0-122
37-3x=-122
3x=37-(-122)
3x=159
x=159:3
x=53
vậy x=53
nhớ **** cho mình nha
NX
1
19 tháng 12 2017
a) ta có : \(\left(2x-7\right)-\left(x+135\right)=0\Leftrightarrow2x-7-x-135=0\)
\(\Leftrightarrow x-142=0\Leftrightarrow x=142\) vậy \(x=142\)
b) ta có : \(12-\left(39-3x\right)=0\Leftrightarrow12-39+3x=0\Leftrightarrow3x-27=0\)
\(\Leftrightarrow3x=27\Leftrightarrow x=\dfrac{27}{3}=9\) vậy \(x=9\)
c) ta có : \(\left(14-3x\right)+\left(6+x\right)=0\Leftrightarrow14-3x+6+x=0\)
\(\Leftrightarrow20-2x=0\Leftrightarrow2x=20\Leftrightarrow x=\dfrac{20}{2}=10\) vậy \(x=10\)
TN
10 tháng 10 2020
( 2x - 7 ) - ( x + 135 ) = 0
<=> 2x-7 = 0+x+135
<=> 2x-7=x+135
<=> 2x-x = 7+135
<=> x = 142
Vậy x =2
(Do cậu không ghi rõ đề bài là gì , nên mk nghĩ đề là tìm x )
Học tốt
SV
8
SS
10 tháng 2 2018
a. -3
b. -71
c. -40
d. 358
e. ?i
f. 10
mình chỉ cho đáp án được thôi vì mình đang gấp nên ko thể trình bày được, câu e mình ko hiểu bạn ghi gì hết. bạn gửi lại câu e đi.
10 tháng 2 2018
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=>2x-7=x+135=>2x-x=135+7=>x=142