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a) 7x - 5 = 16 b) 156 - 2x = 82 c) 10x + 65 = 125
=> 7x = 16 + 5 => 2x = 156 - 82 => 10x = 125 - 65
=> 7x = 21 => 2x = 74 => 10x = 60
=> x = 21 : 7 => x = 74 : 2 => x = 60 : 10
=> x = 3 => x = 37 => x = 6
Vậy x = 3 Vậy x = 37 Vậy x = 6
d) 8x + 2x = 25.2 e) 15 + 5x = 40 f) 5x + 2x = 6 - 5
=> 10x = 50 => 5x = 40 - 15 => 7x = 1
=> x = 50 : 10 => 5x = 25 => x = 1 : 7
=> x = 5 => x = 25 : 5 => x = 1/7
Vậy x = 5 => x = 5 Vậy x = 1/7
Vậy x = 5
g) 5x + x = 150 : 2 + 3 h) 6x + 3x = 5 : 5 + 3 i) 5x + 3x = 3 : 3 . 4 + 12
=> 6x = 75 + 3 => 9x = 1 + 3 => 8x = 1 . 4 + 12
=> 6x = 78 => 9x = 4 => 8x = 4 + 12
=> x = 78 : 6 => x = 4 : 9 => 8x = 16
=> x = 13 => x = 4/9 => x = 16 : 8
Vậy x = 13 Vậy x = 4/9 => x = 2
Vậy x = 2
j) 4x + 2x = 68 - 2 : 2 k) 5x + x = 39 - 3 : 3 l) 7x - x = 5 : 5 + 3 . 2 - 7
=> 6x = 68 - 1 => 6x = 39 - 1 => 6x = 1 + 6 - 7
=> 6x = 67 => 6x = 38 => 6x = 7 - 7
=> x = 67 : 6 => x = 38 : 6 => 6x = 0
=> x = 67/6 => x = 19/3 => x = 0
Vậy x = 67/6 Vậy x = 19/3 Vậy x = 0
m) 7x - 2x = 6 : 6 + 44 : 11
=> 5x = 1 + 4
=> 5x = 5
=> x = 5 : 5
=> x = 1
Vậy x = 1
Mỏi tay ~~~~~~~~~~~~~~
18 - 4\(x\) = -20 - 6\(x\)
-4\(x\) + 6\(x\) = - 20 - 18
2\(x\) = - 38
\(x\) = - 19
h, -15 \(\times\) 24 = -7\(x\) + 32
7\(x\) = 360 + 32
7\(x\) = 392
\(x\) = 392:7
\(x\) = 56
i, 15\(x\) -3.(4\(x\) - 6) = -12 + 36
15\(x\) - 12\(x\) + 18 = 24
3\(x\) = 24 - 18
3\(x\) = 6
\(x\) = 2
k, -10\(x\) - 27 = -7\(x\) + 33
-27 - 33 = -7\(x\) + 10\(x\)
3\(x\) = -60
\(x\) = -20
18x -19 = 21 + 8x
18 x - 8x = 21 + 19
10 x = 40
x =4
g) 18 -4x=-20-6x
-4x + 6x = -20 - 18
2x = -38
x= -19
k, -10 \(x\) - 27 = -7\(x\) + 33
-27 - 33 = -7\(x\) + 10\(x\)
3\(x\) = -60
\(x\) - 20
m, -17\(x\) - 24 = -9\(x\) - 40
-24 + 40 = -9\(x\) + 17\(x\)
8\(x\) = 16
\(x\) = 2
7x - 5 = 16
7x = 16 + 5
7x = 21 (Chia cả hai vế 7 để có được x)
7x/7 = 21/7
x = 3
a.7x-5=21
=>7x=21
=>x=21:1
=>x=3
b.156-2x=82
=>2x=156-82
=>2x=74
=>x=74:2
=>x=37
c.10x+65=125
=>10x=125-65
=>10x=60
=>x=60:10
=>x=6
d.8x+2x=25x2^2
=>10x=25x4
=>10x=100
=>x=100:10
=>x=10
e.15+5x=40
=>5x=40-15
=>5x=25
=>x=25:5
=>x=5
f.5x+2x=6^2-1
=>7x=36-1
=>7x=35
=>x=35:7
=>x=5
tick dung minh nha
a, 117 - \(x\) = 28 - (-7)
117 - \(x\) = 28 + 7
117 - \(x\) = 35
\(x\) = 117 - 35
\(x\) = 82
b, \(x\) - (-38 - 2\(x\)) = (-3) - 8 + 2\(x\)
\(x\) + 38 + 2\(x\) = - 11 + 2\(x\)
3\(x\) + 38 = - 11 + 2\(x\)
3\(x\) - 2\(x\) = - 11 - 38
\(x\) = - 49
a)4.(x+3)-(2x-12)=x-(-11+4)
4x+12-2x+12=x+11-4
2x+24=x+7
2x-x=-24+7
x=-17
b)-(4x-13)+(5x-4)=-3-(-15+7)
-4x+13+5x-4=-3+15-7
(-4x+5x)+13-4=12-7
x+9=5
x=-4
c)(5x-3)-(-2x+4)=6x-12
5x-3+2x-4=6x-12
5x+2x-6x=3+4-12
x=-5
d)(15x+20)-(9x-3)=5x-(-12)
15x+20-9x+3=5x+12
15x-9x-5x=-20-3+12
x=-11
e,(7x+14)+(3x-8)=-(-9x+3)
7x+14+3x-8=9x-3
7x+3x-9x=-14+8-3
x=-9
e, \(18x-19=21+8x\)
\(\Rightarrow18x-8x=21+19\)
\(\Rightarrow10x=30\)
\(\Rightarrow x=3\)
Vậy \(x=3\)
g, \(18-4x=-20-6x\)
\(\Rightarrow-4x+6x=-20-18\)
\(\Rightarrow-2x=-38\)
\(\Rightarrow x=19\)
Vậy \(x=19\)
h, \(-15x-24=-7x-32\)
\(\Rightarrow-15x+7x=-32+24\)
\(\Rightarrow-8x=-8\)
\(\Rightarrow x=1\)
Vậy \(x=1\)
i, \(15x-3\left(4x-6\right)=-12+36\)
\(\Rightarrow15x-12x+18=-12+36\)
\(\Rightarrow7x=-12+36-18\)
\(\Rightarrow7x=6\)
\(\Rightarrow x=\frac{6}{7}\)
Vậy \(x=\frac{6}{7}\)
k, \(-10x-27=-7x+33\)
\(\Rightarrow-10x+7x=33+27\)
\(\Rightarrow-3x=60\)
\(\Rightarrow x=-20\)
m, \(-17x-24=-9x-40\)
\(\Rightarrow-17x+9x=-40+24\)
\(\Rightarrow-8x=-16\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
n, \(-23x-25=-18x+75\)
\(\Rightarrow-23x+18x=75+25\)
\(\Rightarrow-5x=100\)
\(\Rightarrow x=-20\)
Vậy \(x=-20\)
p, \(-5x+7\left(2x-3\right)=4\left(x-4\right)\)
\(\Rightarrow-5x+14x-21=4x-16\)
\(\Rightarrow-5x+14x-4x=-16+21\)
\(\Rightarrow5x=5\)
\(\Rightarrow x=1\)
Vậy \(x=1\)
q, \(24-6\left(3x+1\right)=-5\left(4x-4\right)-8\)
\(\Rightarrow24-18x-6=-20x+20-8\)
\(\Rightarrow-18x+20x=20-8-24+6\)
\(\Rightarrow2x=-6\)
\(\Rightarrow x=-3\)
Vậy \(x=-3\)
r, \(18-4\left(6-2x\right)=-3\left(4x+5\right)-11\)
\(\Rightarrow18-24+8x=-12x-15-11\)
\(\Rightarrow8x+12x=-15-11-18+24\)
\(\Rightarrow20x=-20\)
\(\Rightarrow x=-1\)
Vậy \(x=-1\)
s, \(-5\left(4x-5\right)-14=6\left(2-3x\right)-10x-9\)
\(\Rightarrow-20x+25-14=12-18x-10x-9\)
\(\Rightarrow-20x+18x+10x=12-9+14-25\)
\(\Rightarrow8x=-8\)
\(\Rightarrow x=-1\)
Vậy \(x=-1\)
Chúc bạn hok tốt!!! tỷ tỷ
2: 12-10x=25-30x
=>20x=13
=>x=13/20
3: \(3\left(2x+3\right)-2\left(4x-5\right)=10x+21\)
=>6x+9-8x+10=10x+21
=>10x+21=-2x+19
=>12x=-2
=>x=-1/6
4: \(\Leftrightarrow25x-15-6x+12=11-5x\)
=>19x-3=11-5x
=>24x=14
=>x=7/12
5: \(\Leftrightarrow8-12x-5+10x=4-6x\)
=>4-6x=-2x+3
=>-4x=-1
=>x=1/4
6: \(\Leftrightarrow32x-24-6+9x=13-40x\)
=>41x-30=13-40x
=>81x=43
=>x=43/81
7: \(\Leftrightarrow10x-5+20x=5x-11\)
=>30x-5=5x-11
=>25x=-6
=>x=-6/25
ko ai bit ak
\(7x+4x=990\)
\(7x+4x=11x\)
\(11x=2.3^2.5.11\)
\(11x=990\)
Rút gọn nha
=90
\(2\left(2x+5\right)-4=16\)
\(2\left(2x+5\right)-4=2\left(2x+3\right)\)
\(2\left(2x+3\right)2^4\)
\(4x+6=16\)
\(4x=10\)
Rút gọn nha
\(2x=5\)
\(\frac{5}{2}\)
5x-2x=23
\(5x-2x=3x\)
\(3x=23\)
\(\frac{23}{3}\)
15x-10x=45-15
\(15x-10x=5x\)
\(5x=2.3.5\)
\(5x=30\)
Rút gọn nha
Đáp số =6