-4x-28 = 22
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\(3x+12=36\)
\(\Leftrightarrow3x=36-12\)
\(\Leftrightarrow3x=24\)
\(\Leftrightarrow x=24\div3\)
\(\Leftrightarrow x=8\)
\(4x+28=134\)
\(\Leftrightarrow4x=134-28\)
\(\Leftrightarrow4x=106\)
\(\Leftrightarrow x=106\div4\)
\(\Leftrightarrow x=\frac{53}{2}\)
\(5x-22=-17\)
\(\Leftrightarrow5x=22-17\)
\(\Leftrightarrow5x=5\)
\(\Leftrightarrow x=5\div5\)
\(\Leftrightarrow x=1\)
3x + 12 = 36
3x = 36 - 12
3x = 24
x = 8
4x + 28 = 134
4x = 134 - 28
4x = 106
x = 106 : 4
x = 26 , 5
5x - 22 = -17
5x = -17 + 22
5x = 5
x = 1
3x - 184 = -49
3x = -49 + 184
3x = 135
x = 135 : 3 = 45
4x + 12 = 56
4x = 56 - 12
4x = 44
x = 11
3x - 127 = - 22
3x = -22 + 127
3x = 105
x = 105 : 3 = 35
3x + 22 = 124
3x = 124 - 22 = 102
x = 102 : 3
x = 34
4x - 9 = 31
4x = 31 + 9 = 40
x = 40 : 4= 10
5x - 211 = -31
5x = -31 + 211
5x = 180
x = 180 : 5
x = 36
21, \(x^3-4x^2+4x=x\left(x^2-4x+4\right)=x\left(x-2\right)^2\)
22, \(15x^2y+20xy^2-25xy=5xy\left(3x+4y-5\right)\)
23, \(4x^2+8xy-3x-6y=4x\left(x+2y\right)-3\left(x+2y\right)=\left(4x-3\right)\left(x+2y\right)\)
24, \(x^3-6x^2+9x=x\left(x^2-6x+9\right)=x\left(x-3\right)^2\)
Tương tự :))
21.\(x^3-4x^2+4x\)
\(=x\left(x^2-4x+4\right)\)
\(=x\left(x-2\right)^2\)
22,\(15x^2y+20xy^2-25xy\)
\(=5xy\left(3x+4y-5\right)\)
23,\(4x^2+8xy-3x-6y\)
\(=4x\left(x+2y\right)-3\left(x+2y\right)\)
\(=\left(4x-3\right)\left(x+2y\right)\)
24\(x^3-6x^2+9x\)
\(=x\left(x^2-6x+9\right)\)
\(=x\left(x-3\right)^2\)
25,\(x^2-xy+x-y\)
\(=x\left(x-y\right)+\left(x-y\right)\)
\(=\left(x+1\right)\left(x-y\right)\)
26.\(xy-2x-y^2+2y\)
\(=x\left(x-2\right)-y\left(y-2\right)\)
\(=\left(x-y\right)\left(x-2\right)\)
27,\(x^2+x-xy-y\)
\(=\left(x^2-xy\right)+\left(x-y\right)\)
\(=x\left(x-y\right)+\left(x-y\right)\)
\(=\left(x+1\right)\left(x-y\right)\)
28,\(x^2+4x-y^2+4\)
\(=\left(x^2+4x+4\right)-y^2\)
\(=\left(x+2\right)^2-y^2\)
\(=\left(x+2-y\right)\left(x+2+y\right)\)
29.\(x^2-2xy+y^2-4\)
\(=\left(x-y\right)^2-2^2\)
\(=\left(x-y-2\right)\left(x-y+2\right)\)
Sai rồi
-4x-28=22
-4x =22+28
-4x =50
x =50:-4
x = 15,5
vậy x =15,5