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a) 125 : X + (32 + 15) = 72
125 : X + 47 = 72
X + 47 = 72 x 125
X + 47 = 62270
X = 62270 - 47
X = 62223
b) (35 + 15) - 2 x X = 86
50 - 2 x X = 86
50 - X = 86 + 2
50 - X = 88
X = 88+ 50
X = 138
a) 35.(x-10)=35
x-10= 35:35
x-10= 1
x= 1+10
x= 10
b) 21.(32-x) =21
32-x = 21:21
32-x = 1
x= 32-1
x= 31
Tìm x :
a. -x + 17 = -12
x = (-12) -17
x = -29
b. -30 + (32-x) = 10
32-x = 10-(-30)
32-x = 40
x = 32 - 40
x = -8
c. \(|2x-1|\) = 7
=> 2x - 1 = 7 hoặc => 2x - 1 = -7
=> x = 4 => x = -3
d. \(|x+3|\) - 5 = 7
\(|x+3|\) = 7 + 5
\(|x+3|\) = 12
=> x + 3 = 12 hoặc => x + 3 = -12
=> x = 12 - 3 => x = (-12) - 3
=> x = 9 => x = -15
e. 16 - ( 42 + x ) = 50
42 + x = 16 - 50
42 + x = -34
x = (-34) - 42
x = -76
g. 128 - 3 . ( x + 4 ) = 23
3 . ( x + 4 ) = 128 - 23
3 . ( x + 4 ) = 105
x + 4 = 105 : 3
x + 4 = 35
x = 35 - 4
x = 31
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) \(10-\left(-5+2\right)+\left(-9\right)=\left(-20+7\right)-x\)
\(-16=-13-x\)
\(x=-13+16\)
\(x=3\)
a) 125 : x + ( 32 + 15 ) = 72
125 : x + 47 = 72
125 : x = 72 - 47
125 : x = 25
x = 125 : 25
x = 5
b) ( 35 + 135 ) - 2 . x = 86
170 - 2 . x = 86
2 . x = 170 - 86
2 . x = 84
x = 84 : 2
x = 42
c) 7 . x - 5 = 65
7 . x = 65 + 5
7 . x = 70
x = 70 : 7
x = 10
A) 125 / x + (32 + 15) = 72
125 / x + 47 = 72
125 / x = 72 - 47
125 / x = 25
x = 125 / 25
x = 5
B)
(35 + 135) - 2 x x = 86
170 - 2 x x = 86
2 x x = 170-86
2 x x = 84
x = 84/2
x = 42
7 x x - 5 = 65
7 x x = 65 -5
7 x x = 60
x = 60/7
x = 8.571428571
a) 125 : x + (32+15) = 72 b) (35+135)-2x=86 c) 7x - 5 =65 d) 125 -3(2x-5)=50 e) 7x+23x+30 =50
125:x + 47 =72 170 - 2x = 86 7x=65+5 3(2x-5) =125-50 x(7+23)+30 =50
125 : x =25 2x = 170-86 7x=70 3(2x-5) =75 x. 30 =20
x = 125:25 2x=104 x=10 2x-5=75:3 x = \(\frac{2}{3}\)
x= 5 x=52 2x-5=25
2x=30
x=15
D)
125 - 3 x (2 x x -5) = 50
3 x (2 x x -5) = 125 -50
3 x (2 x x -5) = 75
2 x x -5 = 75/3
2 x x -5 = 25
2 x x = 25 +5
2 x x = 30
x = 30/2
x = 15
E)
7 x x + 23 x x + 30 = 50
7 x x + 23 x x = 50 - 30
7 x x + 23 x x = 20
(7 + 23) x x = 20
30 x x = 20
x = 20 / 30
x = 2 phần 3
k cho tui nha
a) 125 : x + ( 32+15 ) =72 b) ( 35+135) - 2 x x = 86 c) 7 x x - 5 = 65
125 : x + 47 =72 170 - 2 x x = 86 7 x x = 65 + 5
125 : x =72 -47 2 x x = 170 - 86 7 x x = 70
125 : x = 25 2 x x = 84 x = 70 : 7
x =125 : 25 x = 84 : 2 x = 10
x = 5 x = 42
d) 125 - 3 x ( 2 x x - 5 ) = 50 e) 7 x x + 23 x x + 30 = 50
3 x ( 2 x x - 5 ) = 125 - 50 ( 7 + 23 ) x + 30 = 50
3 x ( 2 x x - 5 ) = 75 30 x x + 30 = 50
2 x x - 5 = 75 : 3 30 x x = 50 - 30
2 x x - 5 = 25 30 x x = 20
2 x x = 25 + 5 x = 20 : 30
2 x x = 30 x = 2/3
x = 30 : 2
x = 15