Question

Answer 1

mn giúp em với ạa

 

Answer 2

1: =(x+y)^2-25

=(x+y)^2-5^2

=(x+y+5)(x+y-5)

2: =10^2-(3x-y)^2

=(10-3x+y)(10+3x-y)

3: =(8x)^2-(8a+b)^2

=(8x-8a-b)(8x+8a+b)

4: =(2ab^2)^2-(c^2d)^2

=(2ab^2-c^2d)(2ab^2+c^2d)

5: =(2x)^3-(ab)^3

=(2x-ab)(4x^2+2axb+a^2b^2)

6: =2(8x^3+27y^3)

=2(2x+3y)(4x^2-6xy+9y^2)

7: =(2x)^3-y^3

=(2x-y)(4x^2+2xy+y^2)

8: =(a+b-2a+b)(a+b+2a-b)

=(-a+2b)*3a

9: =(a+b-a+b)[(a+b)^2+(a+b)(a-b)+(a-b)^2]

=2b*[a^2+2ab+b^2+a^2-b^2+a^2-2ab+b^2]

=2b(3a^2+b^2)

10: =(a+b+a-b)[(a+b)^2-(a+b)(a-b)+(a-b)^2]

=2a*[a^2+2ab+b^2-a^2+b^2+a^2-2ab+b^2]

=2a(3b^2+a^2)