问题
解答题
已知x与y互为相反数,且xy=-
|
答案
x3y+2x2y2+xy3
=xy(x2+2xy+y2)
=xy(x+y)2
∵x与y互为相反数,
∴x+y=0
∵xy=-
,1 4
∴原式=-
×0=01 4
已知x与y互为相反数,且xy=-
|
x3y+2x2y2+xy3
=xy(x2+2xy+y2)
=xy(x+y)2
∵x与y互为相反数,
∴x+y=0
∵xy=-
,1 4
∴原式=-
×0=01 4