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7 tháng 10 2018

 ta có: ab(a + b) + bc(b + c) + ac(a + c) + 3abc 

= ab(a + b) + abc + bc(b + c) + abc + ac(a + c) + abc 

= ab(a + b + c) + bc(a + b + c) + ac(a + b + c) 

= (a + b + c)(ab + bc + ca) 

7 tháng 10 2018

\(ab\left(a+b\right)+bc\left(b+c\right)+ca\left(c+a\right)+2abc\)

\(=ab\left(a+b\right)+abc+bc\left(b+c\right)+abc+ca\left(c+a\right)\)

\(=ab\left(a+b+c\right)+bc\left(b+c+a\right)+ca\left(c+a\right)\)

\(=\left(a+b+c\right)\left(ab+bc\right)+ca\left(c+a\right)\)

\(=b.\left(a+b+c\right)\left(a+c\right)+ca\left(c+a\right)\)

\(=\left(a+c\right)\left[b.\left(a+b+c\right)+ca\right]\)

\(=\left(a+c\right)\left(ab+b^2+bc+ca\right)\)

\(=\left(a+c\right)\left[a\left(b+c\right)+b\left(b+c\right)\right]\)

\(=\left(a+c\right)\left(b+c\right)\left(a+b\right)\)

\(ab\left(a+b\right)+bc\left(b+c\right)+ca\left(c+a\right)+3abc\)

\(=ab\left(a+b\right)+abc+bc\left(b+c\right)+abc+ca\left(c+a\right)+abc\)

\(=ab\left(a+b+c\right)+bc\left(b+c+a\right)+ca\left(c+a+b\right)\)

\(=\left(a+b+c\right)\left(ab+bc+ac\right)\)

Tham khảo nhé~

8 tháng 10 2018

thank you

22 tháng 6 2016

ab(a-b) + bc((b-a)+(a-c)) +ac(c-a) 
=ab(a-b) -bc(a-b) -bc(c-a) +ac(c-a) 
=(a-b)(ab-bc) +(c-a)(ac-bc) 
=(a-b) b (a-c) + (c-a) c (a-b) 
=(a-b)(a-c)(b-c) 

28 tháng 9 2017

a.\(\left(x^2+x\right)^2+3\left(x^2+x\right)+2=\left(x^2+x\right)^2+2\left(x^2+x\right)+\left(x^2+x+2\right)\)

\(=\left(x^2+x\right)\left(x^2+x+2\right)+\left(x^2+x+2\right)=\left(x^2+x+2\right)\left(x^2+x+1\right)\)

b. \(x\left(x+1\right)\left(x+2\right)\left(x+3\right)+1=\left[x\left(x+3\right)\right]\left[\left(x+1\right)\left(x+2\right)\right]+1\)

\(=\left(x^2+3x\right)\left(x^2+3x+2\right)+1\)(1)

Đặt \(t=x^2+3x\)

(1) \(\Leftrightarrow t\left(t+2\right)+1\)

\(=t^2+2t+1=\left(t+1\right)^2\)(2)

Thay \(t=x^2+3x\)vào (2) t/có:

\(\left(t+1\right)^2=\left(x^2+3x+1\right)^2\)

c. dài lắm mình lười làm, bn bấm thử mạng tìm ik nhớ tíck cho mình nha thanks

30 tháng 9 2017

c) ab(a+b)+bc(b+c)+ac(c+a)+3abc
= ab(a+b)+abc+bc(b+c)+abc+ac(a+c)+abc
=ab(a+b+c)+bc(b+c+a)+ac(a+c+b)
=(a+b+c)(ab+bc+ac)
 

15 tháng 9 2019

\(ab\left(a-b\right)-ac\left(a+c\right)+bc\left(2a-b+c\right)\)

\(=a^2b-ab^2-a^2c-ac^2+2abc-b^2c+bc^2\)

\(=a^2b-ab^2-a^2c-ac^2+abc+abc-b^2c+bc^2\)

\(=\left(bc^2-ac^2+abc-a^2c\right)-\left(b^2c-abc-ab^2+a^2b\right)\)

\(=c\left(bc-ac+ab-a^2\right)-b\left(bc-ac-ab+a^2\right)\)

\(=\left(c-b\right)\left(bc-ac+ab-a^2\right)\)

\(=\left(c-b\right)\left[c\left(b-a\right)+a\left(b-a\right)\right]\)

\(=\left(c-b\right)\left(c+a\right)\left(b-a\right)\)

Ta có: \(D=ab\left(a+b\right)+bc\left(b+c\right)+ca\left(c+a\right)+3abc\)

\(=a^2b+ab^2+b^2c+bc^2+ac^2+a^2c+3abc\)

\(=\left(a+b\right)\left(b+c\right)\left(a+c\right)\)

2 tháng 3 2020

\(ab\left(b-a\right)-bc\left(b-c\right)-ac\left(c-a\right)\)

\(=ab\left(b-a\right)-b^2c+bc^2-ac^2+a^2c\)

\(=ab\left(b-a\right)+c^2\left(b-a\right)-c\left(b^2-a^2\right)\)

\(=\left(b-a\right)\left(ab+c^2-bc-ca\right)\)

\(=\left(b-a\right)\left[b\left(a-c\right)-c\left(a-c\right)\right]\)

\(=\left(b-a\right)\left(a-c\right)\left(b-c\right)\)