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x6+3x4y2-8x3y3+3x2y4+y6= x6+3x4y2+3x2y4+y6-8x3y3=(x2+y2)3-(2xy)3
= (x2+y2-2xy)[(x2+y2)2+2xy(x2+y2)+(2xy)2]= (x-y)2(x4+6x2y2+y4+2x3y+2xy3)
(x2+y2-5)2-4x2y2-16xy-16=(x2+y2-5)2-(4x2y2+16xy+16)=(x2+y2-5)2-(2xy+4)2
=(x2+y2-5+2xy+4)(x2+y2-5-2xy-4)=(x2+2xy+y2-1)(x2-2xy+y2-9)=[(x+y)2-1][(x-y)2-32]=(x+y-1)(x+y+1)(x-y-3)(x-y+3)
x4+324=x4+36x2+324-36x2=(x2+18)2-(6x)2=(x2+18-6x)(x2+18+6x)
a/ \(=64y^4+32xy^3+8y^2x^2-32xy^3-16x^2y^2-4x^3y+8x^2y^2+4x^3y+x^4\)
\(=8y^2\left(8y^2+4xy+x^2\right)-4xy\left(8y^2+4xy+x^2\right)+x^2\left(8y^2+4xy+x^2\right)\)
\(=\left(8y^2-4xy+x^2\right)\left(8y^2+4xy+x^2\right)\)
b/ \(=y^4+2xy^3+2x^2y^2-2xy^3-4x^2y^2-4x^3y+2x^2y^2+4x^3y+4x^4\)
\(=y^2\left(y^2+2xy+2x^2\right)-2xy\left(y^2+2xy+2x^2\right)+2x^2\left(y^2+2xy+2x^2\right)\)
\(=\left(y^2-2xy+2x^2\right)\left(y^2+2xy+2x^2\right)\)
c/ \(=x^4+5x^3+7x^2+5x^3+25x^2+35x+3x^2+15x+21\)
\(=x^2\left(x^2+5x+7\right)+5x\left(x^2+5x+7\right)+3\left(x^2+5x+7\right)\)
\(=\left(x^2+5x+3\right)\left(x^2+5x+7\right)\)
d/ \(=x^4+x^3+x^2-x^3-x^2-x+x^2+x+1\)
\(=x^2\left(x^2+x+1\right)-x\left(x^2+x+1\right)+\left(x^2+x+1\right)\)
\(=\left(x^2-x+1\right)\left(x^2+x+1\right)\)
bạn tham khảo 1 số bài rồi tự làm nhé
a) 3x−3+5(1−x)
=3x−3+5−5x
=3x−5x+2
=x(3−5)+2
=−2x+2
=2(1−x)
b) 12a2−3ab+8ac−2bc
=3a(4a−b)+2c(4a−b)
=(4a−b)(3a+2c)
c) x2−25+y2−2xy
=x2−2xy+y2−25
=(x−y)2−52
=(x−y−5)(x−y+5)
a,x4-4x3+8x2-16x+16
=(x4-4x3+4x2)+(4x2-16x+16)
=(x^2-2x)^2+(2x-4)^2
=x^2(x-2)^2+4(x-2)^2
=(x-2)^2(x^2+4)
\(x^2-y^2+4x+4\)
\(=\left(x+2\right)^2-y^2\)
\(=\left(x+2+y\right)\left(x+2-y\right)\)
\(4x^2-y^2+8\left(y-2\right)\)
\(=4x^2-\left(y^2-8y+16\right)\)
\(=4x^2-\left(y-4\right)^2\)
\(=\left(2x+y-4\right)\left(2x-y+4\right)\)
Bạn hội con bò gì đó ơi cho mk tham gia đc không vì là hội học hành nên .....
a,X^3-16x =x(x^2-16)
b,y(y-2)-3(y-2)=(y+3).(y-2)
c,x^2+4x+4-y^2=(x+2)^2-y^2=(x+y+2).(x+2-Y)
D,4^2y^3-12x^2y^4+16X^5y^3=4x^2y^2(y-3y^2+4X^3y)
A) 1/2 x(x^2-4)+4(x+2)
=1/2x(x-2)(x+2)+4(x+2)
=(x+2)(1/2x^2-x+4)
b) 21(x-y)^2-7(x-y)^3
= (x-y)^2(21-7x+7y)
=(x-y)^2.7(3-x+y)
c) 1/8x^3-3/4x^2+3/2x-1
=(1/2x)^3-3.(1/2x)^2.1+3.1/2x.1^2-1
=(1/2x-1)^3
\(x^4y^4+4x^2y^2+4-4x^2y^2=\left(x^2y^2+2\right)^2-\left(2xy\right)^2=\left(x^2y^2-2xy+2\right)\left(x^2y^2+2xy+2\right)\)
\(4x^4y^4+4x^2y^2+1-4x^2y^2=\left(2x^2y^2+1\right)^2-\left(2xy\right)^2=\left(2x^2y^2-2xy+1\right)\left(2x^2y^2+2xy+1\right)\)
1. \(x^4y^4\)+4= \(\left(x^2y^2\right)^2\)+4\(x^2y^2\)+4-4\(x^2y^2\)=(\(x^2y^2\)+2)^2 - 4x^2y^2=(x^2y^2+2-2xy)(X^2y^2+2+2xy) .Câu b tương tự bạn tự làm nhé!