(1⼀2+1⼀3+......1⼀1997)(1+1⼀2+1⼀3+......1⼀1996)-(1+1⼀2+1⼀3+...1⼀1997)(1⼀2+1⼀3+...1⼀1996)=?

2025-01-03 01:09:43
推荐回答(1个)
回答1:

令M=1/2+1/3+......1/1997,N=1/2+1/3+......1/1996
则原式=M(1+N)-(1+M)N=M-N
=(1/2+1/3+......1/1997)-(1/2+1/3+......1/1996)=1/1997