разложите на множители -12b^3-12b^2-3b
48m^3 n-72m^2n+27mn
15cx+2cy-cxy-30c
35a^2-42ab+10a^2b-12ab^2

 -12b^3-12b^2-3b=-3b(4b^2+4b+1)=-3b(2b+1)^2;48m^3 n-72m^2n+27mn=3mn(16m^2-24m-9)= 3mn(4m-3)^2;15cx+2cy-cxy-30c=c(15x+2y-xy-30)=c(x-2)(15-y);35a^2-42ab+10a^2b-12ab^2=a(35a-42b+10ab-12b^2)=a(5a-6b)(2b+7).