How to prove that Nx(N-1)!=N!

How to prove that Nx(N-1)!=N!

题目
How to prove that Nx(N-1)!=N!
U can just type chinese,because I'm a chinese who is a broading-student,the reason why I type Engish is that I don't have a chinese translater
答案
hello,I just need to tpye the expressions.
N!=Nx[(N-1)x(N-2)x……x2x1]=Nx(N-1)!
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