4⼀13x2⼀7 4⼀7x11⼀13的简便方怎么算

2025-04-03 04:50:04
推荐回答(1个)
回答1:

4/13x2/7+4/7x11/13
=4/13x2/7+4/13x11/7
=4/13×(2/7+11/7)
=4/13×13/7
=4/7