题目内容
将下列各式分解因式.
14xy-x2-49y2
把下列各式分解因式:
(1)am-am+1
(2)-12a2m+1bm+2+20am+1b2m+4
(3)14xy(x-y)2n-6x(x-y)2n+1+10y(x-y)2n