2减括号3⼀4-2⼀5反括号等于多少?

2-括号3/4-2/5详细的过程简便计算
2024-12-04 06:52:53
推荐回答(3个)
回答1:

2-(3/4-2/5)
=2-(0.75-0.4)
=2-0.35
=1.65
或者:
2-(3/4-2/5)
=2-(15/20-8/20)
=2-7/20
=1又20/20-7/20
=1又13/20

回答2:

2-(3/4-2/5)
=2-(15/20-8/20)
=2-7/20
=33/20=一又13/20

回答3:

=2-(15/20-8/20)
=2-7/20
=1又13/20