2⼀5×4+1⼀5×2⼀13+2⼀5×12⼀13用简便方法计算

2025-03-05 01:15:21
推荐回答(1个)
回答1:

2/5×4+1/5×2/13+2/5×12/13
=2/5×(4+1/13+12/13)
=2/5×(4+1)
=2/5×5
=2