1)4a^2+4a-4a^2b+b+12)ax^2+16ay^2-a-8axy(3) a(a^2-a-1)+1(4)ab(m^2+n^2)+mn(a^2+b^2)

问题描述:

1)4a^2+4a-4a^2b+b+1
2)ax^2+16ay^2-a-8axy
(3) a(a^2-a-1)+1
(4)ab(m^2+n^2)+mn(a^2+b^2)