(4⼀5+1⼀7)-(1⼀7-1⼀5)要怎样简便计算,急!!!!!!!!!!!!!

2025-02-27 11:03:09
推荐回答(2个)
回答1:

去一个括号,再加一个括号

回答2:

(4/5+1/7)-(1/7-1/5)
=4/5 +1/7-1/7+1/5
=4/5+1/5
=1