2⼀3+2⼀15+2⼀35+2⼀63简便计算

2024-12-16 11:50:53
推荐回答(3个)
回答1:

原式=1-1/3+1/3-1/5+1/5-1/7+1/7-1/9=8/9

回答2:

2/3+2/15+2/35+2/63
=1-1/3+1/3-1/5+1/5-1/7+1/7-1/9
=1-1/9
=8/9

回答3:

赞同新野旁观者的回答