(1⼀4*1⼀7+1⼀7*1⼀10+1⼀10*1⼀13+1⼀13*1⼀16)*3用简便方法怎么做?

2025-02-27 12:24:49
推荐回答(3个)
回答1:

(1/4*1/7+1/7*1/10+1/10*1/13+1/13*1/16)*3
=1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16
=1/4-1/16
=3/16

回答2:

=1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16
=1/4-1/16
=3/16

回答3:

(1/4*1/7+1/7*1/10+1/10*1/13+1/13*1/16)*3
=(1/4-1/7)+(1/7-1/10)+(1/10-1/13)+(1/13-1/16)
=1/4-1/16
=3/16