问题 填空题

若x(x4+y4)=y5,x2(x+y)≠y3,则x3+y3=______.

答案

x5-y5

=x5-x4y+x4y-xy4+xy4-y5

=x5-y5-xy(x3+y3)+xy(x3+y3

∴-xy(x3+y3)+xy(x3+y3)=0

x3+y3=1.

故答案为:1.

填空题
单项选择题 B1型题