32.2 а) 3a+3+na+n=3(a+1) +n(a+1)=(a+1)(3+n)
б )6mx-2m+9x-3=2m(x-1)+3(x-1)=(x-1)(2m+3)
в )ax+3x+4a+12=x(a+3)+4(a+3)=(a+3)(x+4)
г )2mx-3m+4x-6= 2mx+4x-3m-6=2x(m+2)-3(m+2)=(m+2)(2x-3)
32.7
б )20n²-35a-14an+50n=20n²-14an+50n-35a=2n(10n-7a)+5(10n-7a)=
=(10n-7a)((2n+5)