脱式计算,能简算的要简算
7/12+(7/8-3/4)
16/25-(14/19-9/25)
4/5-4/7+1/2
7/10-1/4+3/10-3/4 2- 3/5+1/4
第1个回答 2015-08-28
7/12+(7/8-6/8)=7/12+1/8=14/24+3/24=17/24
16/25-(14/19-9/25)=16/25+9/25-14/19=1-14/19=5/19
4/5-4/7+1/2=28/35-20/35+1/2=8/35+1/2=16/70+35/70=51/70
7/10-1/4+3/10-3/4 2- 3/5+1/4
=7/10+3/10-3/4 2- 3/5
=1-3/4 2- 3/5
=39/42-3/5
=195/210-126/210
=69/210
=23/70
16/25-(14/19-9/25)=16/25+9/25-14/19=1-14/19=5/19
4/5-4/7+1/2=28/35-20/35+1/2=8/35+1/2=16/70+35/70=51/70
7/10-1/4+3/10-3/4 2- 3/5+1/4
=7/10+3/10-3/4 2- 3/5
=1-3/4 2- 3/5
=39/42-3/5
=195/210-126/210
=69/210
=23/70
第2个回答 2015-08-28
好的追答
没有了吗
追答有
好了
还有吗
追答没了
本回答被提问者采纳第3个回答 2015-08-28
7/12+(7/8-3/4)
=7/12 + 1/8
=14/24 + 3/24
= 17/24
16/25-(14/19-9/25)
=16/25 + 9/25 - 14/19
= 1 - 14/19
= 5/19
4/5-4/7+1/2
= 28/35 - 20/35 +1/2
= 8/35+ 1/2
= 16/70 +35/70
= 51/70
7/10-1/4+3/10-3/4
=(7/10 + 3/10)-(1/4 + 3/4)
= 1 - 1
= 0
2- 3/5+1/4
= 10/5 - 3/5 + 1/4
= 7/5 + 1/4
= 28/20 + 5/20
= 33/20
=7/12 + 1/8
=14/24 + 3/24
= 17/24
16/25-(14/19-9/25)
=16/25 + 9/25 - 14/19
= 1 - 14/19
= 5/19
4/5-4/7+1/2
= 28/35 - 20/35 +1/2
= 8/35+ 1/2
= 16/70 +35/70
= 51/70
7/10-1/4+3/10-3/4
=(7/10 + 3/10)-(1/4 + 3/4)
= 1 - 1
= 0
2- 3/5+1/4
= 10/5 - 3/5 + 1/4
= 7/5 + 1/4
= 28/20 + 5/20
= 33/20
第4个回答 2020-06-29
等于一又1/24。