(5⼀12-3⼀7)-(4⼀7-7⼀12)简便方法

2025-03-13 09:13:27
推荐回答(2个)
回答1:

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

回答2:

7/12-3/7+5/12-4/7得数是零