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\(a,2-x=17-\left(-5\right)\)
\(\Rightarrow2-x=17+5\)
\(\Rightarrow2-x=22\)
\(\Rightarrow x=2-22\)
\(\Rightarrow x=-20\)
Vay...
\(b,11-\left(15+11\right)=x-\left(25-9\right)\)
\(\Rightarrow11-26=x-16\)
\(\Rightarrow-15=x-16\)
\(\Rightarrow-15+16=x\)
\(\Rightarrow x=1\)
`@` `\text {Ans}`
`\downarrow`
`a)`
`x + 10 = 20`
`=> x = 20 -10`
`=> x = 10`
Vậy, `x = 10`
`b)`
`2 * x + 15 = 35`
`=> 2x = 35 - 15`
`=> 2x = 20`
`=> x = 20 \div 2`
`=> x = 10`
Vậy, `x = 10`
`c)`
`3 * ( x + 2 ) = 15`
`=> x + 2 = 15 \div 3`
`=> x + 2 = 5`
`=> x = 5 - 2`
`=> x = 3`
Vậy, `x = 3`
`d)`
`10 * x + 15 * 11 = 20 * 10`
`=> 10x + 165 = 200`
`=> 10x = 200 - 165`
`=> 10x = 35`
`=> x = 35 \div 10`
`=> x = 3,5`
Vậy,` x = 3,5`
`e)`
`4 * ( x + 2 ) = 3 * 4`
`=> x + 2 = 12 \div 4`
`=> x + 2 = 3`
`=> x = 3 - 2`
`=> x = 1`
Vậy,` x = 1`
`f)`
`33 x + 135 = 26 * 9`
`=> 33x + 135 = 234`
`=> 33x = 234 - 135`
`=> 33x = 99`
`=> x = 99 \div 33`
`=> x = 3`
Vậy, `x = 3`
`g)`
`2 * x + 15 + 16 + 17 = 100`
`=> 2x + 48 = 100`
`=> 2x = 100 - 48`
`=> 2x = 52`
`=> x = 52 \div 2`
`=> x =26`
`h)`
`2 * (x + 9 + 10 + 11) = 4 . 12 . 25`
`=> 2 * (x + 9 + 10 + 11) = 4*25*12`
`=> 2 * (x + 9 + 10 + 11) = 100*12`
`=> x + 9 + 10 + 11 = 100*12 \div 2`
`=> x + 30 = 600`
`=> x = 600 - 30`
`=> x = 570`
Vậy, `x = 570.`
a) \(x+10=20\Leftrightarrow x=10\)
b) \(2x+15=35\Leftrightarrow2x=20\Leftrightarrow x=10\)
c) \(3.\left(x+2\right)=15\Leftrightarrow x+2=5\Leftrightarrow x=3\)
d) \(10x+15.11=20.10\Leftrightarrow10x+165=200\Leftrightarrow10x=35\Leftrightarrow x=\dfrac{35}{10}=\dfrac{7}{2}\)
e) \(4.\left(x+2\right)=3.4\Leftrightarrow x+2=3\Leftrightarrow x=1\)
f) \(35x+135=26.9\Leftrightarrow35x=234-135\Leftrightarrow35x=99\Leftrightarrow x=\dfrac{99}{35}\)
g) \(2x+15+16+17=100\Leftrightarrow2x+48=100\Leftrightarrow2x=52\Leftrightarrow x=26\)
h) \(2.\left(x+9+10+11\right)=4.12.25\)
\(\Leftrightarrow x+30=2.12.25\)
\(\Leftrightarrow x=600-30\)
\(\Leftrightarrow x=570\)
a, 11 - ( 15 + 11 ) = x - ( 25 - 9 )
11-15-11=x-25+9
-15=x-16
x=1
b, 2 - x = 17 - ( - 5 )
2-x=22
x=-20
c, x - 12 = ( - 9 ) - 15
x-12=-24
x=-12
d, 9 - 25 = ( 7 - x ) - ( 25 + 7 )
(7-x)-32=-16
7-x=16
x=-9
#H
a) x-45= -15+50
x-45= 35
x=35+45
x=80
b) 2x = -35+17
2x = -18
x = -9
c) -3 (x-4)=9-12
-3(x-4)= -3
x-4= 1
x=5
d) -36 - 4x +15 = 11
-36 - 4x = 11- 15
-36- 4x = -4
4x = -36 - (-4)
4x = -36+4 = -32
x = -32 : 4
x = -8
e) 125 - ( 3x - 20 ) = 115
3x - 20 = 125 - 115
3x -20 = 10
3x = 10+20= 30
x = 30: 3
x = 10
tick nhe ban oi
a/ (x-45) - 50 = -15
x - 45 = -15 + 50
x - 45 = 35
x = 35 + 45
x = 80
b/ 2x -17 = -35
2x = -35 + 17
2x = -18
x = -18 : 2
x = -9
a)11-(15+11)=x-(25-9)
11-26=x-16
-15=x-16
x=-15+16
x=1
vậy x=1
b)2-x=17-(-5)
2-x=22
x=2-22
x=-24
vậy x=-24
c)lxl-7=9
lxl=9+7
lxl=16
=>x=+-16
vậy x=+-16
d)3x-40=5x+32
3x-5x=40+32
(3-5)x=72
-2x=72
x=72:(-2)
x=-36
vậy x=-36
a/ => 2 - x = 22 => x = -20
b/ => x - 12 = -24 => x = -12
c/ => 11 - 26 = x - 16
=> -15 = x - 16
=> x = 1
d/ => 5x - x - 2 + 6x - 10 = 0
=> 10x - 12 = 0
=> 10x = 12
=> x = 1,2
a) 2 - x = 17 - ( - 5)
2 - x = 22
x = 2-22
x=-20