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a^2 + b^2 - 2a + 2b - 2ab
= (a^2 - 2ab + b^2) - 2(a - b)
= (a - b)^2 - 2(a - b)
= (a - b)(a - b - 2)
a^2+b^2-2a+2b-2ab
=(a^2+b^2-2ab)-(2a-2b)
=(a-b)^2-2(a-b)
=(a-b)(a-b-2)
\(\Leftrightarrow\left(a+b\right)^2+2\left(a+b\right)+1=\left(a+b+1\right)^2\)
\(a^2+b^2+2a-2b-2ab=a^2-2ab+b^2+2\left(a-b\right)\)
\(=\left(a-b\right)^2+2\left(a-b\right)\)
\(=\left(a-b\right)\left(a-b+2\right)\)
\(4a^2-4b^2-4a+1=4a^2-4a+1-\left(2b\right)^2\)
\(=\left(2a-1\right)^2-\left(2b\right)^2\)
\(=\left(2a-1-2b\right)\left(2a-1+2b\right)\)
phân tích đa thức thành nhân tử
a/x2(x+1)-2x(x+1)+(x+1)=(x+1)(x^2-2x+1)=(x+1)(x-1)^2
b/a2+b2+2a-2b-2ab=(a^2-ab)+(b^2-ab)+2(a-b)=a(a-b)-b(a-b)+2(a-b)=(a-b)(a-b+2)
c/ 4x2-8x+3=(2x-2)^2-1=(2x-2-1)(2x-2+1)=(2x-3)(2x-1)
d/25-16x2=5^2-(4x)^2=(5-4x)(5+4x)
a2 + b2 + 2ab + 2a + 2b + 1
= ( a2 + 2ab + b2 ) + ( 2a + 2b ) + 1
= ( a + b )2 + 2( a + b ) + 12
= ( a + b + 1 )2
3x( x - 2y ) - 6y( 2y - x )
= 3x( x - 2y ) + 6y( x - 2y )
= 3( x - 2y )( x + 2y )
x2 + 2x - 3
= x2 - x + 3x - 3
= x( x - 1 ) + 3( x - 1 )
= ( x - 1 )( x + 3 )
a) \(a^2+b^2+2ab+2a+2b+1\)
\(=\left(a^2+2ab+b^2\right)+\left(2a+2b\right)+1\)
\(=\left(a+b\right)^2+2\left(a+b\right)+1\)
\(=\left(a+b+1\right)^2\)
b) \(3x\left(x-2y\right)-6y\left(2y-x\right)\)
\(=3x\left(x-2y\right)+6y\left(x-2y\right)\)
\(=3\left(x-2y\right)\left(x+2y\right)\)
c) \(x^2+2x-3=x^2-x+3x-3\)
\(=\left(x^2-x\right)+\left(3x-3\right)\)
\(=x\left(x-1\right)+3\left(x-1\right)\)
\(=\left(x-1\right)\left(x+3\right)\)
\(25-a^2+2ab-b^2\)
\(=25-\left(a^2-2ab+b^2\right)\)
\(=5^2-\left(a-b\right)^2\)
\(=\left(5-a+b\right)\left(5+a-b\right)\)
\(a^3b-ab^3+a^2+2ab+b^2\)
\(=\left(a^3b-ab^3\right)+\left(a^2+2ab+b^2\right)\)
\(=ab\left(a^2-b^2\right)+\left(a+b\right)^2\)
\(=ab\left(a-b\right)\left(a+b\right)+\left(a+b\right)^2\)
\(=\left(a+b\right)\left[ab\left(a-b\right)+\left(a+b\right)\right]\)
\(=\left(a+b\right)\left(a^2b-ab^2+a+b\right)\)
Đa thức này không phân tích được nha bạn