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9 tháng 7 2016
\(a^6-a^4+2a^3+2a^2\)
\(=\left[\left(a^3\right)^2-\left(a^2\right)^2\right]+2\left(a^2+a^3\right)\)
\(=\left(a^3-a^2\right)\left(a^3+a^2\right)+2\left(a^3+a^2\right)\)
\(=\left(a^3-a^2+2\right)\left(a^3+a^2\right)\)
\(=a^2.\left(a^3-a^2+2\right)\left(a+1\right)\)
9 tháng 7 2016
\(a^6-a^4+2a^3+2a^2=a^2\left(a^4-a^2+2a+2\right)=a^2\left[a^2\left(a^2-1\right)+2\left(a+1\right)\right]\)
\(=a^2\left[a^2\left(a-1\right)\left(a+1\right)+2\left(a+1\right)\right]=a^2\left(a+1\right)\left(a^3-a^2+2\right)=a^2\left(a+1\right)^2\left(a^2-2a+2\right)\)
13 tháng 10 2016
a) = (xyz+xy) +(z+1) +(yz+zx)+(x+y)
= xy(z+1) +(z+1)+z(x+y)+(x+y)
= (z+1)(xy+1)+(x+y)(Z+1)
=(z+1)(xy+1+x+y)
ML
9 tháng 8 2015
a)27x3+27x2+9x+1+x+1/3
=(3x+1)3+1/3(3x+1)
=(3x+1)[(3x+1)2+1/3]
=(3x+1)(9x2+6x+4/3)
b)8xy3-5xyz-24y2+15z
=(8xy3-24y2)-(5xyz-15z)
=8y2(xy-3)-5z(xy-3)
=(xy-3)(8y2-5z)
c)x4+x3+x+1
=x3(x+1)+(x+1)
=(x+1)(x3+1)
=(x+1)(x+1)(x2-x+1)
=(x+1)2(x2-x+1)
d)a6-a4-2a3+2a2
=a4(a-1)(a+1)-2a2(a-1)
=(a-1)(a5+a4-2a2)
=(a-1)(a5-a4+2a4-2a2)
=(a-1)[a4(a-1)+2a2(a-1)(a+1)]
=(a-1)(a-1)(a4+2a3+2a2)
=(a-1)2(a4+2a3+2a2)
3 tháng 9 2018
\(x^4+x^3+x+1\)
\(=x^3\left(x+1\right)+\left(x+1\right)\)
\(=\left(x+1\right)\left(x^3+1\right)\)
\(=\left(x+1\right)^2\left(x^2-x+1\right)\)
NV
2
10 tháng 8 2016
a)\(\left(a^3-b^3\right)+\left(a-b\right)^2\)
\(=\left(a-b\right)\left(a^2+ab+b^2\right)+\left(a-b\right)^2\)
\(\left(a-b\right)\left(a^2+ab+b^2+a-b\right)\)
b) \(\left(8a^3-27b^3\right)-2a\left(4a^2-9b^2\right)\)
\(=\left(2a-3b\right)\left(4a^2+6ab+9b^2\right)-2a\left(2a-3b\right)\left(2a+3b\right)\)
\(=\left(2a-3b\right)\left(4a^2+6ab+9b^2-4a^2-6ab\right)\)
\(=\left(2a-3b\right)\cdot9b^2\)
10 tháng 8 2016
\(=\left(a-b\right)\left(a^2+ab+b^2\right)+a^2-2ab+b^2\)
= ...........
VT
2
24 tháng 8 2016
2a2b2+2a2c2+2b2c2-a4-b4-c4
=4a2b2-(a4+2a2b2+b4)+(2b2c2+2a2c2)-c4
=2(ab)2-(a+b)2+2c2(a2+b2)+c4
=2(ab)2-[(a+b)2-2c2(a2+b2)+c4]
=2(ab)2-(b2+a2-c2)2
=[(a+b)2-c2][-(a-b)2+c2]
=(a+b-c)(a+b+c)(c-a+b)(a+c-b)
NT
25 tháng 8 2016
\(2a^2b^2+2a^2c^2+2b^2c^2-a^4-b^4-c^4\)
\(=4a^2b^2-\left(a^4+2a^2b^2+b^4\right)+\left(2b^2c^2+2a^2c^2\right)-c^4\)
\(=2\left(ab\right)^2-\left(a+b\right)^2+2c^2\left(a^2+b^2\right)+c^4\)
\(=2\left(ab\right)^2-\left[\left(a+b\right)^2-2c^2\left(a^2+b^2\right)+c^4\right]\\ =2\left(ab\right)^2-\left(b^2+a^2-c^2\right)^2\)
=\(\left[\left(a+b\right)^2-c^2\right]\left[-\left(a-b\right)^2+c^2\right]\\ =\left(a+b+c\right)\left(a+b+c\right)\left(c-a+b\right)\left(a+c-b\right)\)
24 tháng 8 2021
Sửa ý đầu: \(\left(2a+3\right)x-\left(2a+3\right)y+2a+3\)
\(=\left(2a=3\right)\left(x-y+1\right)\)
\(\left(a-b\right)c+\left(b-a\right)y-a+b\)
\(=\left(a-b\right)c-\left(a-b\right)y-\left(a-b\right)\)
\(=\left(a-b\right)\left(c-y-1\right)\)
\(81a^2+18a+1\)
\(=\left(9a+1\right)^2\)
\(a^3-1\)
\(=\left(a-1\right)\left(a^2+a+1\right)\)
\(a^5-b^5\)
Áp dụng công thức: \(a^{2n+1}-b^{2n+1}=\left(a-b\right)\left(a^{2n}+a^{2n-1}.b+...+b^{2n-1}.a+b^{2n}\right)\)
\(=\left(a-b\right)\left(a^4+a^3b+a^2b^2+ab^3+b^{\text{4}}\right)\)
NT
1
2 tháng 7 2017
a(a+2b)3 -b(2a+b)3
\(=a\left(a^3+6a^2b+12ab^2+8b^3\right)-b\left(8a^3+12a^2b+6ab^2+b^3\right)\)
\(=a^4+6a^3b+12a^2b^2+8ab^3-8a^3b-12a^2b^2-6ab^3-b^4\)
\(=a^4-2a^3b+2ab^3-b^4\)
\(=\left[\left(a^2\right)^2+ \left(b^2\right)^2\right]-2ab\left(a^2-b^2\right)\)
\(=\left(a^2+b^2\right)\left(a^2-b^2\right)-2ab\left(a^2-b^2\right)\)
\(=\left(a^2-b^2\right)\left(a^2-2ab+b^2\right)\)
\(=\left(a-b\right)\left(a+b\right)\left(a-b\right)^2\)
\(=\left(a-b\right)^3\left(a+b\right)\)
KN
1
KY
13 tháng 9 2019
\(2\left(x-3\right)^3-4\left(3-x\right)^2-x+3\)
\(=2\left(x-3\right)^3-4\left(x-3\right)^2-\left(x-3\right)\)
\(=\left(x-3\right)\left[2\left(x-3\right)^2-4\left(x-3\right)-1\right]\)
\(=\left(x-3\right)\left[2\left(x^2-6x+9\right)-4x+12-1\right]\)
\(=\left(x-3\right)\left[2x^2-12x+18-4x+11\right]\)
\(=\left(x-3\right)\left[2x^2-16x+29\right]\)
\(ab\left(a-b\right)-2a+2b\)
\(=ab\left(a-b\right)-2\left(a-b\right)\)
\(=\left(ab-2\right)\left(a-b\right)\)