1⼀4+7⼀10-2⼀5,有什么简便方法计算?

2025-04-13 04:20:03
推荐回答(4个)
回答(1):

1/4+7/10-2/5
=0.25+0.7-0.4
=0.55

回答(2):

1/4+7/10-2/5
=0.25+(0.7-0.4)
=0.25+0.3
=0.55

回答(3):

原式=7/10-4/10+1/4
=6/20+5/20
=11/20

回答(4):

1/4+7/10-2/5
=5/20+14/20-8/20
=25/20-8/20
=17/20