计算(1-1⼀2-1⼀3-1⼀4-1⼀5)(1⼀2+1⼀3+1⼀4+1⼀5+1⼀6)-(1-1⼀2-1⼀3-1⼀4-1⼀5-1⼀6)(1⼀2+1⼀3+1⼀4+1⼀5)

2025-04-05 09:23:36
推荐回答(2个)
回答1:

原式=(1-1/2-1/3-1/4-1/5)*(1/2+1/3+1/4+1/5)+1/6*(1-1/2-1/3-1/4-1/5)
-(1-1/2-1/3-1/4-1/5)*(1/2+1/3+1/4+1/5)+1/6*(1/2+1/3+1/4+1/5)
=1/6*(1-1/2-1/3-1/4-1/5+1/2+1/3+1/4+1/5)
=1/6*1
=1/6

回答2:

设m=1/2+1/3+1/4+1/5
原式=(1-m)*(m+1/6)-(1-m-1/6)*m
=m-m*m+1/6-1/6*m-m+m*m+1/6*m
=1/6