8.下列各式中,从左到右的变形是因式分解的是( )
0 279533 279541 279547 279551 279557 279559 279563 279569 279571 279577 279583 279587 279589 279593 279599 279601 279607 279611 279613 279617 279619 279623 279625 279627 279628 279629 279631 279632 279633 279635 279637 279641 279643 279647 279649 279653 279659 279661 279667 279671 279673 279677 279683 279689 279691 279697 279701 279703 279709 279713 279719 279727 366461
| A. | 3x+3y-5=3(x+y)-5 | B. | x2+2x+1=(x+1)2 | C. | (x+1)(x-1)=x2-1 | D. | x(x-y)=x2-xy |