\(a.a\left(b+c\right)+3b+3c=a\left(b+c\right)+3\left(b+c\right)=\left(b+c\right)\left(a+3\right)\)

\(b.a\left(c-d\right)+c-d=\left(c-d\right)\left(a+1\right)\)

\(c.b\left(a-c\right)+5a-5c=b\left(a-c\right)+5\left(a-c\right)=\left(a-c\right)\left(b+5\right)\)

\(d.a\left(m-n\right)+m-n=\left(m-n\right)\left(a+1\right)\)

\(e.mx+my+5x+5y=m\left(x+y\right)+5\left(x+y\right)=\left(x+y\right)\left(m+5\right)\)

\(f.ma+mb-a-b=m\left(a+b\right)-\left(a+b\right)=\left(a+b\right)\left(m-1\right)\)

\(g.4x+by+4y+bx=4x+bx+by+4y=x\left(b+4\right)+y\left(b+4\right)=\left(b+4\right)\left(x+y\right)\)

\(h.1-ax-x+a=\left(a+1\right)-x\left(a+1\right)=\left(a+1\right)\left(1-x\right)\)

\(k.x^{m+2}-x^m=x^m\left(x^2-1\right)=x^m\left(x-1\right)\left(x+1\right)\)

\(m.\left(a-b\right)^2-\left(b-a\right)\left(a+b\right)=\left(b-a\right)^2-\left(b-a\right)\left(a+b\right)=\left(b-a\right)\left(b-a-a-b\right)=-2a\left(b-a\right)\)

\(n.a\left(a-b\right)\left(a+b\right)-\left(a^2-2ab+b^2\right)=a\left(a-b\right)\left(a+b\right)-\left(a-b\right)^2=\left(a-b\right)\left(a^2+ab-a+b\right)\)

a) \(A=5\left(x-y\right)+ax-ay=\left(a+5\right)\left(x-y\right)\)

b) \(B=a\left(x+y\right)-4x-4y=\left(x+y\right)\left(a-4\right)\)

c) \(C=xz+yz-5\left(x+y\right)=\left(x+y\right)\left(z-5\right)\)

d) \(D=a\left(x-y\right)+bx-by=\left(a+b\right)\left(x-y\right)\)

e) \(E=x\left(x+y\right)-5x-5y=\left(x-5\right)\left(x+y\right)\)

f) \(F=x^2-x-y^2-y=\left(x-y\right)\left(x+y\right)-\left(x+y\right)=\left(x+y\right)\left(x-y-1\right)\)

g) \(G=x^2-xy+x-y=x\left(x-y\right)+x-y=\left(x+1\right)\left(x-y\right)\)

A = 5(x - y) + ax - ay = 5(x - y) + a(x - y) = (a + 5)(x - y)

B = a(x + y) - 4x - 4y = a(x + y) - 4(x + y) = (a - 4)(x + y)

C = xz + yz - 5(x + y) = z(x + y) - 5(x + y) = (z - 5)(x + y)

D = a(x - y) + bx - by = a(x - y) + b(x - y) = (a + b)(x - y)

E = x(x + y) - 5x - 5y = x(x + y) - 5(x + y) = (x - 5)(x + y)

F = x² - x - y² - y = (x² - y²) - (x + y) = (x² - xy + xy - y²) - (x + y) = [x(x - y) + y(x - y)] - (x + y) = (x - y)(x + y) - (x + y) = (x + y)(x - y - 1)

G = x² - xy + x - y = x(x - y) + (x - y) = (x + 1)(x - y)                                                 

A = 5( x - y ) + ax - ay

= 5( x - y ) + a( x - y )

= ( x - y )( 5 + a )

B = a( x + y ) - 4x - 4y

= a( x + y ) - 4( x + y )

= ( x + y )( a - 4 )

C = xz + yz - 5( x + y )

= z( x + y ) - 5( x + y )

= ( x + y )( z - 5 )

D = a( x - y ) + bx - by

= a( x - y ) + b( x - y )

= ( x - y )( a + b )

E = x( x + y ) - 5x - 5y

= x( x + y ) - 5( x + y )

= ( x + y )( x - 5 )

F = x² - x - y² - y

= ( x² - y² ) - ( x + y )

= ( x - y )( x + y ) - ( x + y )

= ( x + y )( x - y - 1 )

G = x² - xy + x - y

= x( x - y ) + ( x - y )

= ( x - y )( x + 1 )

A = 4acx + 4bcx + 4ax + 4bx ( đã sửa '-' )

= 4x( ac + bc + a + b )

= 4x[ c( a + b ) + ( a + b ) ]

= 4x( a + b )( c + 1 )

B = ax - bx + cx - 3a + 3b - 3c

= x( a - b + c ) - 3( a - b + c )

= ( a - b + c )( x - 3 )

C = 2ax - bx + 3cx - 2a + b - 3c

= x( 2a - b + 3c ) - ( 2a - b + 3c )

= ( 2a - b + 3c )( x - 1 )

D = ax - bx - 2cx - 2a + 2b + 4c

= x( a - b - 2c ) - 2( a - b - 2c )

= ( a - b - 2c )( x - 2 )

E = 3ax² + 3bx² + ax + bx + 5a + 5b

= 3x²( a + b ) + x( a + b ) + 5( a + b )

= ( a + b )( 3x² + x + 5 )

F = ax² - bx² - 2ax + 2bx - 3a + 3b

= x²( a - b ) - 2x( a - b ) - 3( a - b )

= ( a - b )( x² - 2x - 3 )

= ( a - b )( x² + x - 3x - 3 )

= ( a - b )[ x( x + 1 ) - 3( x + 1 ) ]

= ( a - b )( x + 1 )( x - 3 )

1, \(a.\left(b+c\right)+3b+3c=a.\left(b+c\right)+3.\left(b+c\right)\)= \(\left(b+c\right).\left(3+a\right)\)

2, \(a.\left(m-n\right)+\left(m-n\right)=\left(m-n\right).\left(a+1\right)\)

3, \(7a^2-7ax-9a+9x=7a.\left(a-x\right)-9.\left(a-x\right)\)= \(\left(a-x\right).\left(7a-9\right)\)

4, \(4x+by+4y+bx=4.\left(x+y\right)+b.\left(x+y\right)\)= \(\left(x+y\right).\left(4+b\right)\)

5, \(ay-ax-2x+2y=a.\left(y-x\right)+2.\left(y-x\right)\)= \(\left(y-x\right).\left(a+2\right)\)

    Chúc bạn học tốt. Có gì không hiểu thì chat hỏi mik nhé. ^^

thank bn nhiều nha

1. a(b+c)+3b+3c=a(b+c)+3(b+c)=(b+c)(a+3)

2.a(m-n)+(m-n)=(m-n)(a+1)

3. 7a² -7ax-9a+9x=7a(a-x)-9(a-x)=(a-x)(7w-9

4. 4x+by+4y+bx=(4x+4y)+(by+bx)

5. ay-ax-2x+2y=(ay+2y)-(ax+2x)=y(a+2)-x(a+2)=(a+2)(y-x)

a Đề sai: )

b

\(a^3-a^2x-ay+xy\\ =a^2\left(a-x\right)-y\left(a-x\right)\\ =\left(a-x\right)\left(a^2-y\right)\)

c

\(4x^2-y^2+4x+1\\ =\left(2x\right)^2+2.2x.1+1-y^2\\ =\left(2x+1\right)^2-y^2\\ =\left(2x+1-y\right)\left(2x+1+y\right)\)

d

\(x^4+2x^3+x^2\\ =x^4+x^3+x^3+x^2\\ =x^3\left(x+1\right)+x^2\left(x+1\right)\\ =\left(x^3+x^2\right)\left(x+1\right)\)

e

\(5x^2-10xy+5y^2-5z^2\\ =5\left(x^2-2xy+y^2-z^2\right)\\ =5\left[\left(x-y\right)^2-z^2\right]\\ =5\left(x-y-z\right)\left(x-y+z\right)\)

c: =(2x+1)^2-y^2

=(2x+1+y)(2x+1-y)

d: =x^2(x^2+2x+1)

=x^2(x+1)^2

e: =5(x^2-2xy+y^2-z^2)

=5[(x-y)^2-z^2]

=5(x-y-z)(x-y+z)

\(1)4x^2-25+\left(2x+7\right).\left(5.2x\right)\)

\(=\left(2x\right)^2-5^2-\left(2x+7\right).\left(2x-5\right)\)

\(=\left(2x.5\right)\left(2x+5\right).\left(2x+7\right)\left(2x-5\right)\)

\(=\left(2x-5\right)\left(2x+5-2x+7\right)\)

\(=\left(2x-5\right).12\)

\(2)3x+4-x^2-4x\)

\(=3(x+4)-\left(x+4\right)\)

\(=\left(3-x\right)\left(x+4\right)\)

\(3)5x^2-2y^2-10x+10y\)

\(=5\left(x^2-y^2\right)-10\left(x-4\right)\)

\(=5\left(x-y\right)\left(x+y\right)-10\left(x-y\right)\)

\(=\left(x-y\right)[5(x+y)-10]\)

Còn lại bn lm nốt nha! 

\(a.a\left(m-n\right)+m-n\)

\(=a\left(m-n\right)+\left(m-n\right)\)

\(=\left(a+1\right)\left(m-n\right)\)

\(b.ma+mb-a-b\)

\(=m\left(a+b\right)-\left(a+b\right)\)

\(=\left(m-1\right)\left(a+b\right)\)

\(c.4x+by+4y+bx\)

\(=\left(4x+4y\right)+\left(bx+by\right)\)

\(=4\left(x+y\right)+b\left(x+y\right)\)

\(=\left(b+4\right)\left(x+y\right)\)

\(d.1-ax-x+a\)

\(=\left(a-ax\right)+\left(1-x\right)\)

\(=a\left(1-x\right)+\left(1-x\right)\)

\(=\left(a+1\right)\left(1-x\right)\)

1.a(m-n)+m-n=am-an+m-n=(am+m)-(an+n)=m(a+1)-n(a+1)=(a+1)(m-n)

2.ma+mb-a-b=(ma-a)+(mb-b)=a(m-1)+b(m-1)=(m-1)(a+b)

3.4x+by+4y+bx=(4x+bx)+(4y+by)=x(4+b)+y(4+b)=(4+b)(x+y)

4.1-ax-x+a=(1+a)-(ax+x)=(1+a)-x(a+1)=(1+a)(1-x)

1.A

2.C

3.B

4.C

a

c

b

c

(x-1)y^2-4(x-1)y