问题
计算题
分解下列因式
(1)(y-1)(y-3)+1
(2)-2x3y+8xy3
答案
(1)解 :(y-1)(y-3) +1 =y2-4y+3+1
=y2-4y+4 =(y-2)2
(2)解 :-2x3y+8xy3 =-2xy(x2-4y2)
=-2xy(x+2y)(x-2y)
分解下列因式
(1)(y-1)(y-3)+1
(2)-2x3y+8xy3
(1)解 :(y-1)(y-3) +1 =y2-4y+3+1
=y2-4y+4 =(y-2)2
(2)解 :-2x3y+8xy3 =-2xy(x2-4y2)
=-2xy(x+2y)(x-2y)