7一(3/4-2/5)简便计算

2024-11-26 13:40:25
推荐回答(3个)
回答1:

7-(3/4-2/5)
=7-(15/20-8/20)
=7-7/20
=6又13/20

回答2:

7-(3/4-2/5)
=7-7/20
=6又20分之13

回答3:

7-(3/4-2/5)
=7-(15/20-8/20)
=7-7/20
=7×(1-1/20)
=133/20
=6.65