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15 tháng 9 2015
a) 3a2-6ab+3b2-12c2
=3.(a2-2ab+b2-4c2)
=3.[(a-b)2-4c2]
=3.(a-b-2c)(a-b+2c)
25 tháng 5 2017
a)\(81x^2-6yz-9y^2-z^2\)
\(=81x^2-\left(z-3y\right)^2\)
\(=\left(9x-z+3y\right)\left(9x+z-3y\right)\)
b)\(x^2y-x^3-9y+9x\)
\(=x^2\left(y-x\right)-9\left(y-x\right)\)
\(=\left(y-x\right)\left(x-3\right)\left(x+3\right)\)
c)\(3a^2-6ab+3b^2-12c^2\)
\(=3\left(a^2-2ab+b^2-4z^2\right)\)
\(=3\left[\left(a-b\right)^2-4z^2\right]\)
\(=3\left(a-b-2z\right)\left(a-b+2z\right)\)
TM
26 tháng 5 2017
a)\(81x^2-6yz-9y^2-z^2=\left(9x\right)^2-\left(9y^2+6yz+z^2\right)=\left(9x\right)^2-\left(3y+z\right)^2=\left(9x-3y-z\right)\left(9x+3y+z\right)\)b)\(x^2y-x^3-9y+9x=x^2\left(y-x\right)-9\left(y-x\right)=\left(x^2-9\right)\left(y-x\right)=\left(x-3\right)\left(x+3\right)\left(y-x\right)\)
c)\(3a^2-6ab+3b^2-12c^2=3\left(a^2-2ab+b^2-4c^2\right)=3\left[\left(a-b\right)^2-\left(2c\right)^2\right]=3\left(a-b-2c\right)\left(a-b+2c\right)\)
MQ
6
PA
30 tháng 10 2016
\(x^3-x^2-5x+125\)
\(=\left(x+5\right)\left(x^2-5x+25\right)-x\left(x+5\right)\)
\(=\left(x+5\right)\left(x^2-5x+25-x\right)\)
\(=\left(x+5\right)\left(x^2-6x+25\right)\)
\(x^6-x^4-9x^3+9x^2\)
\(=x^4\left(x^2-1\right)-9x^2\left(x-1\right)\)
\(=x^4\left(x-1\right)\left(x+1\right)-9x^2\left(x-1\right)\)
\(=x^2\left(x-1\right)\left[x^2\left(x+1\right)-9\right]\)
\(=x^2\left(x-1\right)\left(x^3+x^2-9\right)\)
\(x^4-4x^3+8x^2-16x+16\)
\(=\left(x^2+4\right)^2-4x\left(x^2+4\right)\)
\(=\left(x^2+4\right)\left(x^2+4-4x\right)\)
\(=\left(x^2+4\right)\left(x-2\right)^2\)
\(3a^2-6ab+3b^2-12c^2\)
\(=3\left(a^2-2ab+b^2-4c^2\right)\)
\(=3\left[\left(a-b\right)^2-\left(2c\right)^2\right]\)
\(=3\left(a-b+2c\right)\left(a-b-2c\right)\)
25 tháng 6 2018
a ) \(3a^2-6ab+3b^2-12c^2\)
\(=3\left(a^2-2ab+b^2-4c^2\right)\)
\(=3\left[\left(a-b\right)^2-\left(2c\right)^2\right]\)
\(=4\left(a-b-2c\right)\left(a-b+2c\right)\)
b ) \(x^2-25+y^2+2xy\)
\(=\left(x^2+2xy+y^2\right)-25\)
\(=\left(x+y\right)^2-5^2\)
\(=\left(x+y-5\right)\left(x+y+5\right)\)
c )
\(x^2y-x^3-9y+9x\)
\(=x^2\left(y-x\right)-9\left(y-x\right)\)
\(=\left(y-x\right)\left(x^2-9\right)\)
\(=\left(y-x\right)\left(x-3\right)\left(x+3\right)\)
d )\(x^2\left(x-1\right)+16\left(1-x\right)\)
\(=x^2\left(x-1\right)-16\left(x-1\right)\)
\(=\left(x-1\right)\left(x^2-16\right)\)
\(=\left(x-1\right)\left(x-4\right)\left(x+4\right)\)
BT
1
27 tháng 5 2022
a: \(=\left(m^2-2m+1\right)-\left(n^2-2np+p^2\right)\)
\(=\left(m-1\right)^2-\left(n-p\right)^2\)
\(=\left(m-1-n+p\right)\left(m-1+n-p\right)\)
b: \(=3\left(a^2-2ab+b^2-4c^2\right)\)
\(=3\left[\left(a-b\right)^2-\left(2c\right)^2\right]\)
\(=3\left(a-b-2c\right)\left(a-b+2c\right)\)
PH
0
7 tháng 10 2017
b) a2 + 2ab + b2 - ac - bc
= ( a + b)2 - c (a + b)
= ( a + b).( a + b - c )
c) x3 - x2 - x + 1
= x2 .(x - 1) - ( x - 1)
= ( x- 1).( x2 - 1)
= ( x-1).(x-1).(x+1)
AN
7 tháng 10 2017
1)\(3a^2+6ab+3b^2-12c^2\)
\(=3\left(a^2+2ab+b^2-4c^2\right)\)
\(=3\left[\left(a^2+2ab+b^2\right)-4c^2\right]\)
\(=3\left[\left(a+b\right)^2-\left(2c\right)^2\right]\)
\(=3\left(a+b-2c\right)\left(a+b+2c\right)\)
MT
19 tháng 6 2015
3a-3b+a^2-2ab+b^2
=(3a-3b)+(a2-2ab+b2)
=3(a-b)+(a-b)2
=(a-b)[3+(a-b)]
=(a-b)(3+a-b)
3a2 - 6ab + 3b2 - 12c2
= 3a2 - 3a x 2b + 3b2 - 3 x 4c2
= 3(a2 -a x b +b2 - 4c2)
phân tích thành nhân tử :
3a2 - 6ab + 3b2 - 12c2
=3(a\(^2\)-2ab+b\(^2\)-4c\(^2\))
=3[(a-b)\(^2\)-(2c)\(^2\)]
=3(a-b-2c)(a-b+2c)