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22 tháng 9 2020

a) 4x2 - 5xy + y2 = 4x2 - 4xy - xy + y2 = 4x( x - y ) - y( x - y ) = ( x - y )( 4x - y )

b) x2 - 4xy + 3y2 = x2 - xy - 3xy + 3y2 = x( x - y ) - 3y( x - y ) = ( x - y )( x - 3y )

c) 9x2 + 6xy - 8y2 = 9x2 - 6xy + 12xy - 8y2 = 9x( x - 2/3y ) + 12y( x - 2/3y ) = ( x - 2/3y )( 9x + 12y )

d) 2x2 + 3xy - 5y2 = 2x2 - 2xy + 5xy - 5y2 = 2x( x - y ) + 5y( x - y ) = ( x - y )( 2x + 5y )

e) x2 - 35y2 - 2xy = x2 + 5xy - 7xy - 35y2 = x( x + 5y ) - 7y( x + 5y ) = ( x + 5y )( x - 7y )

f) 2x2 + 10xy + 8y2 = 2( x2 + 5xy + 4y2 ) = 2( x2 + xy + 4xy + 4y2 ) = 2[ x( x + y ) + 4y( x + y ) ] = 2( x + y )( x + 4y )

g) x2 - 10xy + 16y2 = x2 - 2xy - 8xy + 16y2 = x( x - 2y ) - 8y( x - 2y ) = ( x - 2y )( x - 8y )

h) 4x2 + 4xy - 15y2 = 4x2 - 6xy + 10xy - 15y2 = 4x( x - 3/2y ) + 10y( x - 2/3y ) = ( x - 2/3y )( 4x + 10y )

i) -7xy + 3x2 + 2y2 = 3x2 - xy - 6xy + 2y2 = 3x( x - 1/3y ) - 6y( x - 1/3y ) = ( x - 1/3y )( 3x - 6y )

j) 56y2 + 4x2 - 36xy = 4( x2 - 9xy + 14y2 ) = 4( x2 - 2xy - 7xy + 14y2 ) = 4[ x( x - 2y ) - 7y( x - 2y ) ] = 4( x - 2y )( x - 7y )

6 tháng 7 2016

x2-y2+z2-t2-2xz+2yt

=(x2-2xz+z2).-(y2-2yt+t2)

=(x-z)2.-(y-t)2

7 tháng 7 2016

\(x^2-y^2+z^2-t^2-2xz+2yt\)

\(=\left(x^2-2xz+z^2\right)-\left(y^2+2yt-t^2\right)\)

\(=\left(x-z\right)^2-\left(y-t\right)^2\)

\(=\left(x-z+y-t\right).\left(x-z-y+t\right)\)

chắc chắn 100% là đúng nha bạn

11 tháng 10 2018

\(a,2x^2-4x+2=2\left(x^2-2x+1\right)=2\left(x-1\right)^2\)

\(b,4x-4y+x^2\left(y-x\right)=4\left(x-y\right)-x^2\left(x-y\right)=\left(x-y\right)\left(2-x\right)\left(2+x\right)\)

\(c,2xz+y^2-x^2-z^2=y^2-\left(x^2-2xz+z^2\right)=y^2-\left(x-z\right)^2=\left(y-x+z\right)\left(y+x-z\right)\)

\(d,3a^2-3ab+9b-9a=3a\left(a-b\right)-9\left(a-b\right)=\left(3a-9\right)\left(a-b\right)=3\left(a-3\right)\left(a-b\right)\)

\(f,x^2+5x+6=x^2+2x+3x+6=x\left(x+2\right)+3\left(x+2\right)=\left(x+2\right)\left(x+3\right)\)

31 tháng 8 2020

a. \(2a^2+5ab-3b^2-7b-2\)

\(=\left(2a^2+6ab+2a\right)-\left(ab+3b^2+b\right)-\left(2a+6b+2\right)\)

\(=2a\left(a+3b+1\right)-b\left(a+3b+1\right)-2\left(a+3b+1\right)\)

\(=\left(2a-b-2\right)\left(a+3b+1\right)\)

b. \(2x^2-7xy+x+3y^2-3y\)

\(=\left(2x^2-xy\right)-\left(6xy-3y^2\right)+\left(x-3y\right)\)

\(=x\left(2x-y\right)-3y\left(2x-y\right)+\left(x-3y\right)\)

\(=\left(x-3y\right)\left(2x-y\right)+\left(x-3y\right)\)

\(=\left(x-3y\right)\left(2x-y+1\right)\)

c. \(6x^2-xy-2y^2+3x-2y\)

\(=\left(6x^2+3xy\right)-\left(4xy-2y^2\right)+\left(3x-2y\right)\)

\(=3x\left(2x+y\right)-2y\left(2x+y\right)+\left(3x-2y\right)\)

\(=\left(3x-2y\right)\left(2x+y\right)+\left(3x-2y\right)\)

\(=\left(3x-2y\right)\left(2x+y+1\right)\)

10 tháng 2 2017


a) 5x2 - 10x = 5x( x - 2 )

b) x2 - y2 - 2x + 2y = (x2 - y2) - (2x - 2y)

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

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

c) 4x2 - 4xy - 8y2 = (4x2 - 4xy + 8y2) - 9y2

                           = (2x - 9y2) - 3y2

                           = (2x - y - 3y) (2x - y + 3y)

                           = (2x - 4y) (2x + 2y)

                            = 4(x - 2y) (x + y)

10 tháng 2 2017


a) 5x2 - 10x = 5x( x - 2 )

b) x2 - y2 - 2x + 2y = (x2 - y2) - (2x - 2y)

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

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

c) 4x2 - 4xy - 8y2 = (4x2 - 4xy + 8y2) - 9y2

                           = (2x - 9y2) - 3y2

                           = (2x - y - 3y) (2x - y + 3y)

                           = (2x - 4y) (2x + 2y)

                            = 4(x - 2y) (x + y)

10 tháng 7 2016

\(x^2-y^2+z^2-t^2-2xz+2yt\)

\(=\left(x^2+z^2-2xz\right)-\left(y^2+t^2-2yt\right)\)

\(=\left(x-z\right)^2-\left(y-t\right)^2\)

\(=\left(x-z-y+t\right)\left(x-z+y-t\right)\)

10 tháng 7 2016

x2-y2+z2-t2-2xz+2yt

=(x2-2xz+z2)+(-y2+2yt-t2)

=(x2-2xz+z2)-(y2-2yt+t2)

=(x-z)2-(y-t)2

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

28 tháng 9 2017

x+ z-y+ 2xz 

= x2 + 2xz + z - y2

= (x+z)^2 - y^2

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

28 tháng 9 2017

Giải ra chưa? :v