这几题帮我做下我去吃饭回来.a^3b-2a^2b^2+ab^32.8(a-b)^2-2(b-a)3.(x^2+4y^2)^2-16x^2y^24.(y-x)^2+2x-2y5.a^3+a^2-a-16.a^4b-6a^3b+9a^2b7.x^3y-2x^2y^2+xy^38.m^3n-9mn9.m(n

Question

这几题帮我做下 我去吃饭回来.
  a^3b-2a^2b^2+ab^3      2.8(a-b)^2-2(b-a)      3.(x^2+4y^2)^2-16x^2y^2     4.   (y-x)^2+2x-2y
 5.    a^3+a^2-a-1               6.   a^4b-6a^3b+9a^2b      7.  x^3y-2x^2y^2+xy^3      8.m^3n-9mn    
       9.  m(n-3)+2(3-n)     10.6x(x-y)^2+3(y-x)^3      

Answer 1

1 =ab(a^2-2ab+b^2) =ab(a-b)^2
2 =8(a-b)^2+2(a-b) =2(a-b) =2(a-b)(4a-4b+1)
3 =(x^2+4y^2)^2-(4xy)^2 =(x^2+4y^2+4xy)(x^2+4y^2-4xy) =(x+2y)^2(x-2y)^2
4 =(x-y)^2+2(x-y) =(x-y)(x-y+2)
5 =a^3-a+a^2-1 =a(a^2-1)+a^2-1 =(a+1)(a^2-1) =(a+1)^2(a-1)
6 =a^2b(a^2-6a+9b) 题目有木有打错?
7 =xy(x^2-2xy+y^2) =xy(x-y)^2
8 =mn(m^2-9) =mn(m+3)(m-3)
9 =m(n-3)-2(n-3) =(m-2)(n-3)
10 =6x(y-x)^2+3(y-x)^3 =3(y-x)^2 =3(x+y)(y-x)^2