用简便方法做(12⼀5-7⼀3)-(7⼀4-12⼀7)=

2025-03-23 09:39:59
推荐回答(2个)
回答1:

(12/5-7/3)-(7/4-12/7)
=12/5-7/3-7/4+12/7
=(12/5+12/7)-(7/3+7/4)
=1-1
=0

回答2:

(12/5-7/3)-(7/4-12/7)
=12/5-7/3-7/4+12/7
=(12/5+12/7)-(7/3+7/4)
=1-1
=0