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1. = 2(a+b)
2. =2(a-b)
3.=2(a+2b-3c)
4.=3(a-2b-3c)
5.=-4(a+2b+3c)
6.=-5(x+2xy+3y)
7.=-7(a+2ab+3b)
8.=6(xy-2x-3y)
9.=8(xy-3y+2x)
10.=9(ab-2a+1)
Lần sau bn cần ghi đề rõ ràng hơn 
11.=x(y-1)
12.=a(x+1)
13.=m(x+y+1)
14.=-a(x+y+1)
15.=-a(x2+x+1)
16.=-2a(x+2y)
17.=2a(x-y+1)
18.=2(2ax-ay-2)
19.=5a(1-2x-3)
20.=-2ab(a+2b+3)
1, 2a+2b = 2( a + b )
2, 2a-2b = 2( a - b )
3, 2a+4b-6c = 2( a + 2b - 3c )
4, 3a-6b-9c = 3( a - 2b - 3c )
5, xy-x = x( y - 1 )
6, -5x-10xy-15y = -5( x + 2xy + 3y )
7, -7a-14ab-21b = -7( a + 2ab + 3b )
8, 6xy-12x-18y = 6 ( xy - 2x - 3y )
9, 8xy-24y+16x = 8 ( xy - 3y + 2x )
10, 9ab-18a+9 = 9( ab - 2a + 1 )
11, ax+a = a( x + 1 )
12, mx+my+m = m( x + y + 1 )
13, -ax-ay-a = -a( x + y +1 )
14, -2ax-4ay = -2a( x + 2y )
15, 2ax-2ay+2a = 2a( x - y + 1 )
16, 4ax-2ay-2 = 2( 2ax - a - 1 )
17, 5a-10ax-15a = 5a( 1 - 2x - 3 ) = 5a( -2x - 2 )
18, 5ax-15ay+20a = 5a( x - 3y + 4 )
19, 3a2x-6a2y+12a = 3a( ax - 2ay + 4 )
20, 2axy-4a2xy2+6a3x\(^2\) = 2ax( y - 2ay\(^2\) + 3a\(^2\)x )
a) 15x + 15y = 15(x + y)
b) 6x - 10y = 2(3x - 5y)
c) 2a + 4b - 6c = 2(a + 2b - 3c)
d) 6xy - 12x - 18y = 6(xy - 2x - 3y)
e) 2(x + y) - 5a(x + y) = (2 - 5a)(x + y)
f) 6x(x - y) + 5(y - x) = 6x(x - y) + (-5)(x - y) = (6x - 5)(x - y)
a) \(15x+15y=15\left(x+y\right)\)
b) \(6x-10y=2\left(3x-5y\right)\)
c) \(2a+4b-6c=2\left(a+2b-3c\right)\)
d) \(6xy-12x-18y=6\left(xy-2x-3y\right)\)
e) \(2\left(x+y\right)-5a\left(x+y\right)=\left(2-5a\right)\left(x+y\right)\)
f) \(6x\left(x-y\right)+5\left(y-x\right)=6x\left(x-y\right)-5\left(x-y\right)=\left(6x-5\right)\left(x-y\right)\)
a) \(2a-4b=2\left(a-2b\right)\)
c) \(2ax-2ay+2a=2a\left(x-y+1\right)\)
e) \(3xy\left(x-4\right)-9x\left(4-x\right)=3x\left(x-4\right)\left(y+3\right)\)
b,d xem lại đề
1: 2a+2b=2(a+b)
2: 2a+4b+6c
=2*a+2*2b+2*3c
=2(a+2b+3c)
3: \(-7a-14ab-21b=-7\left(a+2ab+3b\right)\)
4: \(2ax-2ay+2a=2a\left(x-y+1\right)\)
5: \(=3a\cdot ax-3a\cdot2ay+3a\cdot4=3a\left(ax-2ay+4\right)\)
6: \(=2\cdot2ax-2\cdot ay-2\cdot1=2\cdot\left(2ax-ay-1\right)\)
7: =a^2-(2b)^2
=(a-2b)(a+2b)
8: =(5a)^2-1^2
=(5a-1)(5a+1)
9: =9(16a^2-9)
=9(4a-3)(4a+3)
1) a^2 + b^2 + 2a - 2b - 2ab = (a^2 - 2ab + b^2) + (2a-2b) = (a-b)^2 + 2(a-b) = (a-b)(a-b+2)
2) 4a^2 - 4b^2 - 4a + 1 = ( 4a^2 - 4a +1) - 4b^2 = (2a-1)^2 - 4b^2 = (2a-1-2b)(2a-1+2b)
3) a^3+6a^2+12a+8= (a^3+8)+(6a^2+12a)= (a+2)(a^2-2a+4)+6a(a+2)=(a+2)(a^2-2a+4+6a)=(a+2)(a^2+4a+4)=(a+2)(a+2)^2=(a+2)^3
1) \(-4a-8b-12c=-4\cdot\left(a+2b+3c\right)\)
2) \(9ab-18a+9=9\cdot\left(ab-2a+1\right)\)
3) \(-ax^2-ax-a=-a\left(x^2+x+1\right)\)
4) \(-2a^2b-4ab^2-6ab=-2ab\left(a+2b+3\right)\)
5) \(mxy-m^2x+my=m\left(xy-mx+y\right)\)
6) \(12x^3y-6xy+3x=3x\left(4x^2y-2y+1\right)\)
7) \(mx\left(a+b\right)-m\left(a+b\right)=m\left(a+b\right)\left(x-1\right)\)
8) \(x^{m+2}-x^{m+1}=x^{m+1}\left(x-1\right)\)
9) \(5x^2y\left(x-7\right)-5xy\left(7-x\right)=5x^2y\left(x-7\right)+5xy\left(x-7\right)=5xy\left(x-7\right)\left(x+1\right)\)
1) -4a - 8b - 12c = -4 ( a + 2b + 3c)
2) 9ab - 18a + 9 = 9 ( ab - a +1 )
3) -ax2 - ax - a = -a ( x2 + x + 1)
4) - 2a2b - 4ab2 - 6ab = -2ab ( a + 2b + 3 )
5)mxy - m2x + my = m ( xy - mx + y )
6)12x3y - 6xy + 3x = 3x ( 4x2y - 2y + 1 )
7) mx ( a+ b) - m (a+b) = (a+b) ( mx-m ) = m ( a+b)(x-1)
8) xm+2 - xm+1 = xm + 1 (x -1 )
9) 5x2y ( x-7 ) - 5xy ( 7 -x )
= 5x2y ( x -7 ) + 5xy ( x-7 )
= 5xy ( x +1 ) (x-7)
a) =2(a+b)
b) =2(a-2b)
c) =2(a+2b-3c)
d) =3(a-2b+3c)
e)= -4(a+2b+3c)
f) =-5(x+2xy+3y)
g) =-7(a+2ab+3b)
h) = 6(xy-2x-3y)
k) = 8(xy-3y+2x)
n)=9(ab-2a+1)