6.2 提取公因式法 同步练习
【知识盘点】
1.分解因式:
(1)ma+mb+mc=m( );
(2)3a2-6ab+a=______(3a-6b+1);
(3)-15a2+5a=________(3a-1);
(4)-22xy+4x2y-6x3y2=-2xy( ).
2.写出下列各式分解因式时应提取的公因式:
(1)3x2-3y应提取的公因式是________.
(2)2a+3ab应提取的公因式是________.
(3)12st-18t应提取的公因式是________.
(4)2xy+4yxz-10yz应提取的公因式是________.
(5)3ax3y+6x4yz应提取的公因式是________.
(6)7a2b3-21ab2c应提取的公因式是_________.
3.分解因式时,多项式中应提取的公因式是各项系数的_________和各项都含有的相同字母的______之积.
4.在括号前添上“+”或“-”号.
(1)x-y=______(y-x); (2)(x-y)2=_____(y-x)2;
(3)-x-y=_____(x+y); (4)(x-y)3=_____(y-x)3. 5.(1)-x2+5x-7=-( |