问题
填空题
已知x+y=6,xy=2,则x3y+2x2y2+xy3的值等于______.
答案
∵x+y=6,xy=2,
∴x3y+2x2y2+xy3
=xy(x2+2xy+y2)
=xy(x+y)2
=2×36
=72.
故答案为72.
已知x+y=6,xy=2,则x3y+2x2y2+xy3的值等于______.
∵x+y=6,xy=2,
∴x3y+2x2y2+xy3
=xy(x2+2xy+y2)
=xy(x+y)2
=2×36
=72.
故答案为72.