八年级数学整式的乘法同底数幂的乘法， y×y的n+1次方—2y的n次方×y的2次方+y的n-1次方×y的3次方，过程

Question

如题所述

Answer 1

y×y的n+1次方—2y的n次方×y的2次方+y的n-1次方×y的3次方
=y的n+2次方-2y的n+2次方+y的n+2次方
=y的n+2次方-y的n+2次方
=0

Answer 2

y·y^n+1－2y^n·y²+y^n-1·y³
=y^n+2-2y^n+2+y^n+2
=0