Phân tích đa thức thành nhân tử:
x^2-2014xy-2016xz+(2015^2-1)yz
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Lời giải :
\(x^2-2014xy-2016xz+\left(2015^2-1\right)yz\)
\(=x^2-2014xy-2016xz+\left(2015-1\right)\left(2015+1\right)yz\)
\(=x^2-2014xy-2016xz+2014\cdot2016\cdot yz\)
\(=x\left(x-2014y\right)-2016z\left(x-2014y\right)\)
\(=\left(x-2014y\right)\left(x-2016z\right)\)
1/ \(\left(a-b\right)\left(a^2+3ab+b^2\right)+\left(a+b\right)^3+ab\left(b-a\right)=\left(a^2+2ab+b^2+ab\right)\left(a-b\right)+\left(a+b\right)^3+ab\left(b-a\right)\)= \(\left(a^2+2ab+b^2\right)\left(a-b\right)+\left(a+b\right)ab+\left(a-b\right)^3-ab\left(a-b\right)\)
= \(\left(a+b\right)^2\left(a-b\right)+\left(a+b\right)^3\)
= \(\left(a+b\right)^2\left(a-b+a+b\right)=2a\left(a+b\right)^2\)
k mình nhé!
x2 - 2014xy - 2016xz + (20152 - 1)yz
= x2 - 2014xy - 2016xz + (2015 - 1)(2015 + 1)yz
= x2 - 2014xy - 2016xz + 2014.2016.yz
= (x2 - 2014xy) - (2016xz - 2014.2016.yz)
= x(x - 2014y) - 2016z(x - 2014y)
= (x - 2014y)(x - 2016z)
#TT
x2y + xy2 + x2z + xz2 + y2z + yz2 +3xyz
=(x2y+x2z)+(xy2+xz2)+(y2z+yz2)+3xyz
=x2(y+z)+x(y2+z2)+yz(y+z)+2xyz+xyz
=x2(y+z)+x(y2+z2+2yz)+yz(y+z+x)
=(y+z)x(x+y+z)+yz(y+x+z)
=(x+y+z)(xy+xz+yz)
x2y + xy2 + x2z + xz2 + y2z + yz2 + 3xyz
=(x2y + xy2 + xyz) + (x2z + xyz + xz2) + (xyz + y2z + yz2)
=xy(x + y + z) + xz(x + y + z) + yz(x + y +z)
=(x + y + z)(xy + xz + yz)
\(x^4-x^2+2x+2\)
\(=x^4-2x^3+2x^2+2x^3-4x^2+4x+x^2-2x+2\)
\(=\left(x^4-2x^3+2x^2\right)+\left(2x^3-4x^2+4x\right)+\left(x^2-2x+2\right)\)
\(=x^2\left(x^2-2x+2\right)+2x\left(x^2-2x+2\right)+\left(x^2-2x+2\right)\)
\(=\left(x^2-2x+2\right)\left(x^2+2x+1\right)\)
\(=\left(x^2-2x+2\right)\left(x+1\right)^2\)