如题所述
第1个回答 2020-03-17
7/10-(3/4-2/5)
=14/20-(15/20-8/20)
=14/20-7/20
=7/20
=14/20-(15/20-8/20)
=14/20-7/20
=7/20
第2个回答 2023-03-16
我写给你计算过程:
7/10-(3/4-2/5)
=7/10-3/4+2/5
=(7/10+2/5)-3/4
=(7/10+4/10)-3/4
=11/10-3/4
=22/20-15/20
=7/20
7/10-(3/4-2/5)
=7/10-3/4+2/5
=(7/10+2/5)-3/4
=(7/10+4/10)-3/4
=11/10-3/4
=22/20-15/20
=7/20
第3个回答 2020-03-17
7/10-(3/4-2/5)
=7/10-3/4+2/5
=14/20-15/20+8/20
=14/20+8/20-15/20
=22/20-15/20
=7/20本回答被网友采纳
=7/10-3/4+2/5
=14/20-15/20+8/20
=14/20+8/20-15/20
=22/20-15/20
=7/20本回答被网友采纳
第4个回答 2020-05-28
7/10-(3/4-2/5)
=7/10-3/4+2/5
=14/20-15/20+8/20
=14/20+8/20-15/20
=22/20-15/20
=7/20
=7/10-3/4+2/5
=14/20-15/20+8/20
=14/20+8/20-15/20
=22/20-15/20
=7/20