Помогите с 2а.06 и 2а.07 пожалуйста

6a
1)a-(y+x-2xy)=a-(y-x)=(a-y+x)(a+y-x)
2)(a-y+x)(a+y-x) :(a+y-x)/(a+y+x)=(a-y+x)(a+y-x) *(a+y+x)/(a+y-x)=
=(a-y+x)(a+y+x) либо (a+x)-y

7a
1)1/3(1+3p+9p)+p(3p-1)(3p+1)/(3p-1)(9p+3p+1)=
=1/3(1+3p+9p)+(3p+p)/(9p+3p+1)=(1+9p+3p)/(9p+3p+1)=1/3
2)1/3:1/(3p+1)=(3p+1)/3