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\(x^2-y^2+4-4x\)
\(=\left(x^2-4x+4\right)-y^2\)
\(=\left(x-2\right)^2-y^2\)
\(=\left(x-2+y\right)\left(x-2-y\right)\)
1)=x(x-1)-y(y-1)
2)=(x-2)2 -y2
3)=(2x+1)2 -9y2+1
#Mình k biết viết bình phương, thông cảm bạn nhé!
\(a^3-a^2x-ay+xy\)
\(=a^2\left(a-x\right)-y\left(a-x\right)\)
\(=\left(a-x\right)\left(a^2-y\right)\)
\(4x^2-y^2+4x+1\)
\(=\left(4x^2+4x+1\right)-y^2\)
\(=\left(2x+1\right)^2-y^2=\left(2x-y+1\right)\left(2x+y+1\right)\)
\(x^3-x+y^3-y\)
\(=\left(x^3+y^3\right)-\left(x+y\right)\)
\(=\left(x+y\right)\left(x^2-xy+y^2\right)-\left(x+y\right)\)
\(=\left(x+y\right)\left(x^2-xy+y^2-1\right)\)
a)a3 - a2x - ay +xy
=(a3 - a2x) - (ay - xy)
=a2(a-x) - y(a-x)
=(a-x).(a2 - y)
\(x^3+4x^2+4x+3\)
\(=x^3+3x^2+x^2+3x+x+3\)
\(=x^2\left(x+3\right)+x\left(x+3\right)+\left(x+3\right)\)
\(=\left(x+3\right)\left(x^2+x+1\right)\)
\(x^2-y^2+4y-4\)
\(=x^2-\left(y^2-4y+4\right)\)
\(=x^2-\left(y-2\right)^2\)
\(=\left(x-y+2\right)\left(x+y-2\right)\)
\(x^4+x^3y-xy^3-y^4\)
\(=x^3\left(x+y\right)-y^3\left(x+y\right)\)
\(=\left(x+y\right)\left(x^3-y^3\right)\)
\(=\left(x+y\right)\left(x-y\right)\left(x^2+xy+y^2\right)\)
Chúc bạn học tốt.
\(1.\)
\(x^2-2x+1-xy-y=\left(x-1\right)^2-y\left(x-1\right)=\left(x-1\right)\left(x-1-y\right)\)
\(2.\)
\(x^3-4x^2+4x-2x+2=x\left(x^2-4x+4\right)-2\left(x-1\right)=x\left(x-2\right)^2-2\left(x-1\right)\)
\(3.\)
\(10x-25-x^2+4y^2=4y^2-\left(x^2-10x+25\right)=4y^2-\left(x-5\right)^2=\left(2y+x-5\right)\left(2y-x+5\right)\)
\(4.\)
\(4x^2-2x+2xy-y=2x\left(2x-1\right)+y\left(2x-1\right)=\left(2x-1\right)\left(2x+y\right)\)
\(5.\)
\(4x\left(x-3\right)^2-3x^2+9x=4x\left(x-3\right)^2-3x\left(x-3\right)=\left(x-3\right)\left(4x^2-12x-3x\right)\)
4x^4+y^4= 4x^4 +4x^2y^2+y^4-4x^2y^2= ( 2x^2 + y^2 ) ^2 - ( 2xy ) ^2
= (2x^2 + 2xy +y^2)( 2x^2 - 2xy + y^2)
1) Phân tích đa thức thành nhân tử
a) \(x^2+2x+1-y^2\)
b) \(x^2+4x+3\)
c) \(4x^2-9y^2\)
d) \(x^3-27y^3\)
a) \(x^2+2x+1-y^2=\left(x+1\right)^2-y^2=\left(x+1-y\right)\left(x+1+y\right)\)
b) \(x^2+4x+3=x^2+4x+4-1=\left(x+2\right)^2-1=\left(x+1\right)\left(x+3\right)\)
c) \(4x^2-9y^2=\left(4x-9y\right)\left(4x+9y\right)\)
d) \(x^3-27y^3=\left(x-3y\right)\left(x^2+3xy+9y^2\right)\)
a)\(x^2+2x+1-y^2=\left(x+1\right)^2-y^2=\left(x+y-1\right)\left(x-y+1\right)\)
b)\(x^2+4x+3=\left(x+1\right)\left(x+3\right)\)
c)\(4x^2-9y^2=\left(2x-3y\right)\left(2x+3y\right)\)
d)\(x^3-27y^3=\left(x-3y\right)\left(x^2+3xy+9y^2\right)\)
a) \(\Leftrightarrow\left(2x\right)^2+2.2x.1+1-y^2\Leftrightarrow\left(2x+1\right)^2-y^2\Leftrightarrow\left(2x-1-y\right)\left(2x-1+y\right)\)
b)\(\Leftrightarrow\left(x+y\right)\left(x^2-xy+y^2\right)-\left(x+y\right)\Leftrightarrow\left(x+y\right)\left(x^2-xy+y^2-1\right)\)
T I C K cho mình nha cảm ơn
4x2 - y2 +4x + 1 = 4x2 +4x +1 - y2 = ( 2x )2 +2.2x1 +12 - y2= (2x+1)2 -y2