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\(x-120:30=40\)
\(x-120=40.30=1200\)
\(x=1200+120=1320\)
Vậy. \(x=1320\)
a) x - 120 : 30 = 40
x - 4 = 40
x = 40 + 4
x = 44
b) (x - 120) : 35 = 5
x - 120 = 5.35
x - 120 = 175
x = 175 + 120
x = 295
c) (x + 100).4 = 800
x + 100 = 800 : 4
x + 100 = 200
x = 200 - 100
x = 100
d) x.5 + 10.9 = 990
5x + 90 = 990
5x = 990 - 90
5x = 900
x = 900 : 5
x = 180
e) x.14 - x.2 = 120
14x - 2x = 120
12x = 120
x = 120 : 12
x = 10
f) x.13 - x.10 = 240
13x - 10x = 240
3x = 240
x = 240 : 3
x = 80
g) 28.x - 17.x - x = 250
10x = 250
x = 250 : 10
x = 25
\(\left(x.7-7\right)\left(x.12+24\right)=0\)
=> \(\orbr{\begin{cases}x.7-7=0\\x.12+24=0\end{cases}}\)
=> \(\orbr{\begin{cases}7x=7\\12x=-24\end{cases}}\)
=> \(\orbr{\begin{cases}x=1\\x=-2\end{cases}}\)
\(170-\left(4+5x\right)=101\)
=> \(4+5x=170-101\)
=> \(4+5x=69\)
=> \(5x=69-4\)
=> \(5x=65\)
=> \(x=65:5=13\)
(x.7-7).(x.12+24)=0
* x.7-7=0 * x.12+24=0
x.7=7 x.12=24
x=7:7 x=24:12
x=1 x=2
vạy x=1 hoặc x=2
170-(4+5x)=101
4+5x=170-101
4+5x=69
5x=69-4
5x=65
x=65:5
x=13
vậy x=13
250:(2x-4)=145-120
250:(2x+4)=25
2x+4=250:25
2x+4=10
2x=10+4
2x=14
x=14:2
x=7
vậy x=7
6.x+3.x-4.x=105
x.(6+3-4)=105
x.(9-4)=105
x.5=105
x=105:5
x=21
vậy x=21
Bài làm :
\(a,\left(7x-7\right)\left(x-3\right)=0\)
\(\Rightarrow\orbr{\begin{cases}7x-7=0\\x-3=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\x=3\end{cases}}\)
Vậy x = 1 hoặc x = 3 .
\(b,108-18x=54\)
\(18x=108-54\)
\(18x=54\)
\(x=54:18\)
\(x=3\)
\(c,35.\left(x-10\right)=35\)
\(x-10=35:35\)
\(x-10=1\)
\(x=1+10\)
\(x=11\)
\(d,3x+5x=40\)
\(\left(3+5\right)x=40\)
\(8x=40\)
\(x=40:8\)
\(x=5\)
Học tốt
a. ( 7x - 7 ) ( x - 3 ) = 0
<=>\(\orbr{\begin{cases}7x-7=0\\x-3=0\end{cases}}\)<=>\(\orbr{\begin{cases}x=1\\x=3\end{cases}}\)
b. 108 - 18x = 54
=> 18x = 54
=> x = 3
c. 35 ( x - 10 ) = 35
=> x - 10 = 1
=> x = 11
d. 3x + 5x = 40
=> 8x = 40
=> x = 5
a)
(x-35)-120=0
=>x-35=0+120
=>x-35=120
=>x=120-35
=>x=85
b)
124+(118-x)=217
=>118-x=217-124
=>118-x=93
=>x=118-93
=>x=25
c) 125-(x+61)=82
=>x+61=125-82
=>x+61=43
=>x= 43-61
=>x= -18
a)
(x-35)-120=0
=>x-35=0+120
=>x-35=120
=>x=120-35
=>x=85
b)
124+(118-x)=217
=>118-x=217-124
=>118-x=93
=>x=118-93
=>x=25
c) 125-(x+61)=82
=>x+61=125-82
=>x+61=43
=>x= 43-61
=>x= -18
a) (x - 35) - 120 = 0
x - 35 = 120
x = 155
b) 124 + (118 - x) = 217
118 - x = 93
x = 25
c) 156 - (x + 61) = 82
x + 61 = 74
x = 13
a, ( x - 35 ) - 120 = 0
( x - 35 ) = 0 + 120
x - 35 = 120
x = 120 + 35
x = 155
Vậy x = 155
b, 124 + ( 118 - x ) = 217
( 118 - x ) = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
Vậy x = 25
c, 156 - ( x + 61 ) = 82
( x + 61 ) = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
Vậy x = 13
a) \(\left(x-35\right)-120=0\)
\(\Rightarrow x-35=0+120\)
\(\Rightarrow x=120+35\)
\(\Rightarrow x=155\)
b) \(124+\left(118-x\right)=217\)
\(\Rightarrow118-x=217-124\)
\(\Rightarrow x=118-93\)
\(\Rightarrow x=25\)
c) \(156-\left(x+61\right)=82\)
\(\Rightarrow x+61=156-82\)
\(\Rightarrow x=74-61\)
\(\Rightarrow x=13\)
a) ( x - 35 ) - 120 = 0
<=> x - 35 = 120
<=> x = 155
b) 124 + ( 118 - x ) = 217
<=> 118 - x = 93
<=> x = 25
c) 156 - ( x + 61 ) = 82
<=> x + 61 = 74
<=> x = 13
a) ( 5x - 35 ) - 120 = o
\(\Leftrightarrow\)5x - 35 - 120 = 0
\(\Leftrightarrow\)5x - ( 35 + 120 ) = 0
\(\Leftrightarrow\)5x - 155 = 0
\(\Leftrightarrow\)5x = 155
\(\Leftrightarrow\)x = 155 ; 5
\(\Leftrightarrow\)x = 31
a, 5x - 35 = 120
5x = 120 + 35
5x = 155
x = 155 ; 5
x = 31
Câu b bn viết rõ hơn nha mk ko hiểu