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Dùng hằng đẳng thức là xong
a, \(\left(x+y\right)^3-x^3-y^3=x^3+3x^2y+3xy^2+y^3-x^3-y^3\)
\(=3x^2y+3xy^2=3xy\left(x+y\right)\)
b, \(x^2+6xy+9y^2=\left(x+3y\right)^2\)
a) 16x2 - ( x2 + 4 )2
= ( 4x )2 - ( x2 + 4 )2
= [ 4x - ( x2 + 4 ) ][ 4x + ( x2 + 4 ) ]
= ( -x2 + 4x - 4 )( x2 + 4x + 4 )
= [ -( x2 - 4x + 4 ) ]( x + 2 )2
= [ -( x - 2 )2 ]( x + 2 )2
b) ( x + y )3 + ( x - y )3
= [ ( x + y ) + ( x - y ) ][ ( x + y )2 - ( x + y )( x - y ) + ( x - y )2 ]
= ( x + y + x - y )[ x2 + 2xy + y2 - ( x2 - y2 ) + x2 - 2xy + y2 ]
= 2x( 2x2 + 2y2 - x2 + y2
= 2x( x2 + 3y2 )
\(a^3-a^2x-ay+xy\)
\(=a^2\left(a-x\right)-y\left(a-x\right)\)
\(=\left(a-x\right)\left(a^2-y\right)\)
\(4x^2-y^2+4x+1\)
\(=\left(4x^2+4x+1\right)-y^2\)
\(=\left(2x+1\right)^2-y^2=\left(2x-y+1\right)\left(2x+y+1\right)\)
\(x^3-x+y^3-y\)
\(=\left(x^3+y^3\right)-\left(x+y\right)\)
\(=\left(x+y\right)\left(x^2-xy+y^2\right)-\left(x+y\right)\)
\(=\left(x+y\right)\left(x^2-xy+y^2-1\right)\)
a)a3 - a2x - ay +xy
=(a3 - a2x) - (ay - xy)
=a2(a-x) - y(a-x)
=(a-x).(a2 - y)
a) (x + y + z)3 - x3 - y3 - z3
= (x + y + z)3 - z3 - (x3 + y3)
= (x + y + z - z)[(x + y + z)2 + (x + y + z).z + z2) - (x + y)(x2 - xy + y2)
= (x + y)(x2 + y2 + z2 + 2xy + 2yz + 2zx + 2xz + 2yz + z2 + z2) - (x + y)(x2 - xy + y2)
= (x + y)(x2 + y2 + 3z2 + 2xy + 4yz + 4zx) - (x + y)(x2 - xy + y2)
= (x + y)(3z2 + 3xy + 5yz + 4zx)
b) Sửa đề x4 + 2010x2 + 2009x + 2010
= (x4 + x2 + 1) + (2009x2 + 2009x + 2009)
= (x4 + 2x2 + 1 - x2) + 2009(x2 + x + 1)
= [(x2 + 1)2 - x2] + 2009(x2 + x + 1)
= (x2 + x + 1)(x2 - x + 1) + 2009(x2 + x + 1)
= (x2 + x + 1)(x2 - x + 2010)
a)x6-y6+
=[(x2)3-(y2)3]+(x4+x2y2+y4)
=[(x2-y2)(x4+x2y2+y4)]+(x4+x2y2+y4)
=(x4+x2y2+y4)[(x2-y2)+1]
=(x2-xy+y2)(x2+xy+y2)(x2-y2+1)
\(x^2+4x-y^2+4\)
\(=\left(x^2+2.x.2+2^2\right)-y^2\)
\(=\left(x+2\right)^2-y^2\)
\(=\left(x+2-y\right).\left(x+2+y\right)\)
Tham khảo nhé~
\(x^2+4x-y^2+4\)
\(=x^2+4x+4-y^2\)
\(=\left(x^2+4x+4\right)-y^2\)
\(=\left(x^2+2x.2+2^2\right)-y^2\)
\(=\left(x+2\right)^2-y^2\)
\(=\left[\left(x+2\right)+y^2\right].\left[\left(x+2\right)-y^2\right]\)
\(=\left(x+2+y^2\right)\left(x+3-y^2\right)\)
\(x^2-y^2+6x+9=\left(x+3\right)^2-y^2=\left(x+3+y\right)\left(x+3-y\right)\)
\(x^3+3x^2-9x-27=\left(x-3\right)\left(x^2+3x+9\right)+3x\left(x-3\right)=\left(x-3\right)\left(x^2+6x+9\right)=\left(x-3\right)\left(x+3\right)^2\)
a) xy – 3x + 2y – 6
= (xy - 3x) + (2y - 6)
= x(y - 3) + 2(y - 3)
= (y - 3)(x + 2)