做一下这道数学题（用简便方法）0.9+1.9+2.9+3.9+4.9+5.9+6.9 急！
答案:6 悬赏:10 手机版
解决时间 2021-11-11 07:47
- 提问者网友：听门外雪花风
- 2021-11-10 17:54
做一下这道数学题（用简便方法）0.9+1.9+2.9+3.9+4.9+5.9+6.9 急！
最佳答案
- 五星知识达人网友：孤老序
- 2021-11-10 18:35
0.9+1.9+2.9+3.9+4.9+5.9+6.9
=1-0.1+2-0.1+3-0.1+4-0.1+5-0.1+6-0.1+7-0.1
=1+2+3+4+5+6+7-0.1*7
=28-0.7
=27.3
=1-0.1+2-0.1+3-0.1+4-0.1+5-0.1+6-0.1+7-0.1
=1+2+3+4+5+6+7-0.1*7
=28-0.7
=27.3
全部回答
- 1楼网友：千杯敬自由
- 2021-11-10 23:50
0.9+1.9+2.9+3.9+4.9+5.9+6.9
=1+2+3+4+5+6+7-0.1*7
=28-0.7
=27.3
0.9+1.9+2.9+3.9+4.9+5.9+6.9
=1-0.1+2-0.1+3-0.1+4-0.1+5-0.1+6-0.1+7-0.1
=1+2+3+4+5+6+7-0.1*7
=28-0.7
=27.3
=1+2+3+4+5+6+7-0.1*7
=28-0.7
=27.3
0.9+1.9+2.9+3.9+4.9+5.9+6.9
=1-0.1+2-0.1+3-0.1+4-0.1+5-0.1+6-0.1+7-0.1
=1+2+3+4+5+6+7-0.1*7
=28-0.7
=27.3
- 2楼网友：舊物识亽
- 2021-11-10 23:06
=（1+2+3+4+5+6+7）-0.1*7
=28-0.7
=27.3
=28-0.7
=27.3
- 3楼网友：愁杀梦里人
- 2021-11-10 21:27
原式=（1+2+3+4+5+6+7）-0.1*7
=28-0.7
=27.3
=28-0.7
=27.3
参考资料：/加分
- 4楼网友：蕴藏春秋
- 2021-11-10 20:01
27.3 原式=1+2+3+4+5+6+7-7*0.1=27.3
- 5楼网友：杯酒困英雄
- 2021-11-10 19:16
0.9+1.9+2.9+3.9+4.9+5.9+6.9
=1+2+3+4+5+6+7-0.1*7
=28-0.7
=27.3
=1+2+3+4+5+6+7-0.1*7
=28-0.7
=27.3
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