1,2x方-5x-3=(2x-1)(x+3) 2,12x方-50x+8=(12x-2)(x-4)3,-20x方+9x+20=(5x+4)(-4x+5)4,4a方-6a+2=(4a-2)(a-1)5,4y方+4y-5 =(2y+1)²-6=(2y+1+√6)(2y+1-√6)6,3ax方-6ax=3ax(x-2)