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