2⼀3 12⼀7 10⼀3 9⼀7简便计算?

2025-03-25 01:30:12
推荐回答(1个)
回答1:

2/3+12/7+10/3+9/7
=(2/3+10/3)+(12/7+9/7)
=12/3+21/7
=4+3
=7