А) (3a-2b)²-(3a-5b)² = ((3a-2b)-(3a-5b))((3a-2b)+(3a-5b)) = (3a-2b-3a+5b)(3a-2b+3a-5b) = 3b(6a-7b)
б) х³+3х²-4х-12 = х²(х+3)-4(х+3) = (х+3)(х²-4) = (х+3)(х-2)(х+2)
в) а²-2ах+х²-b² = (a-x)²-b² = (a-x-b)(a-x+b)
г) 0,125х³-8 = (0,5х)³-2³ = (0,5х-2)(0,25х²+х+4)