4⼀5-括号里7⼀10-1⼀20,括起来等于多少要过程?

2025-04-02 01:38:06
推荐回答(2个)
回答1:

回答2:

解:4/5-(7/10-1/20)
=4/5-7/10+1/20
=8/10-7/10+1/20
=1/10+1/20
=2/20+1/20
=3/20