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Ta có :
\(x\left(2x-1\right)-4\left(x+1\right)=12+2x\left(x-3\right)\)
\(\Rightarrow2x^2-x-\left[4x+4\right]=12+\left(2x^2-6x\right)\)
\(\Rightarrow2x^2-x-4x-4=12+2x^2-6x\)
\(\Rightarrow2x^2-5x-4=12+2x^2-6x\)
\(\Rightarrow\left(2x^2-5x-4\right)-\left(2x^2-6x\right)=12\)
\(\Rightarrow2x^2-5x-4-2x^2+6x=12\)
\(\Rightarrow x-4=12\)
\(\Rightarrow x=12+4\)
\(\Rightarrow x=16\)
Vậy \(x=16\)
~ Ủng hộ nhé
x(2x - 1) - 4(x +1) = 12+ 2x( x - 3)
➡️ 2x2 - x - 4x - 3 = 12 + 2x2 - 6x
➡️ 2x2 - x - 4x - 2x2 + 6x = 12 +3
➡️ 2x2 - x - 4x - 2x2 + 6x = 15
➡️- 5x + 6x = 15
➡️ x = 15
Hok tốt!!!
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a) 3x - 4 (2x-7) = 3x - 3
3x - 8x + 28 = 3x - 3
=> 3x - 8x - 3x = -3 -28
-8x = -31
x = 31/8
b) 3(2x-7) - (4-2x) = 2x -1
6x - 7 - 4 + 2x = 2x -1
=> 6x + 2x - 2x = -1 + 7+4
6x = 10
x = 5/3
c) (x-2).(2x+12)=0
=> x -2 = 0 => x = 2
2x + 12 = 0 => 2x = -12 => x = -6
KL: x = 2 hoặc x = -6
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\(a,-5.\left(-x+7\right)-3.\left(-x-5\right)=-4.\left(12-x\right)+48\)
\(5x-35-3x+15=-48+4x+48\)
\(2x-10=4x\)
\(2x-4x=10\)
\(-2x=10\)
\(x=-5\)
\(b,\left(-x-7\right)-5.\left(-x-3\right)=12.\left(3-x\right)\)
\(-x-7+5x+15=36-12x\)
\(4x+8=36-12x\)
\(4x+12x=36-8\)
\(16x=28\)
\(x=1,75\)
các câu còn lại tương tự nha
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Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16
7+x=-16
x=-16-7
x=-23
2) 2x – 35 = 15
2x=15+35
2x=50
x=50:2
x=25
3) 3x + 17 = 12
3x=12-17
3x=-5
x=-5/3
4) (2x – 5) + 17 = 6
2x-5=6-17
2x-5=-11
2x=-11+5
2x=-6
x=-6:2
x=-3
5) 10 – 2(4 – 3x) = -4
2(4-3x)=10-(-4)
2(4-3x)=14
4-3x=14:2
4-3x=7
3x=4-7
3x=-3
x=-3:3
x=-1
6) - 12 + 3(-x + 7) = -18
3(-x+7)=-18-(-12)
3(x+7)=-6
x+7=-6:3
x+7=-2
x=-2-7
x=-9
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\(1\)) \(5-\left(10-x\right)=7\)
\(10-x=5-7\)
\(10-x=-2\)
\(x=10-\left(-2\right)\)
\(x=12\)
\(2\)) \(-32-\left(x-5\right)=0\)
\(x-5=-32-0\)
\(x-5=-32\)
\(x=-32+5\)
\(x=-27\)