问题
解答题
若x=3an,y=-
|
答案
anx-ay
=an×3an-a×(-
a2n-1)1 2
=3a2n+
a2n1 2
∵a=2,n=3,
∴3a2n+
a2n1 2
=3×26+
×261 2
=224.
若x=3an,y=-
|
anx-ay
=an×3an-a×(-
a2n-1)1 2
=3a2n+
a2n1 2
∵a=2,n=3,
∴3a2n+
a2n1 2
=3×26+
×261 2
=224.