用简便方法计算2.5×9.9十2.5
答案:6 悬赏:50 手机版
解决时间 2021-02-26 14:54
- 提问者网友：绫月
- 2021-02-25 20:23
用简便方法计算2.5×9.9十2.5
最佳答案
- 五星知识达人网友：上分大魔王
- 2021-02-25 20:37
2.5×9.9十2.5
=2.5×（10-0.1）+2.5
=25-0.25+2.5
=25+2.5-0.25
=27.5-0.25
=27.25
=2.5×（10-0.1）+2.5
=25-0.25+2.5
=25+2.5-0.25
=27.5-0.25
=27.25
全部回答
- 1楼网友：毛毛
- 2021-02-26 04:01
图
- 2楼网友：天凉才是好个秋
- 2021-02-26 02:39
2.5×9.9十2.5 =2.5*（9.9+1）=2.5*（10+0.9）
=25-2.25=22.75
=25-2.25=22.75
- 3楼网友：神鬼未生
- 2021-02-26 01:13
提出一个二点五
- 4楼网友：鱼芗
- 2021-02-25 23:50
原式=2.5×(9.9+1)
=2.5×(10+1-0.1)
=25+2.5-0.25
=25+2.25
=27.25
=2.5×(10+1-0.1)
=25+2.5-0.25
=25+2.25
=27.25
- 5楼网友：北方的南先生
- 2021-02-25 22:11
解：原式=2.5*（10-0.1）+2.5
=25-0.25+2.5
=25+2.5-0.25
=25+（2+0.5）-0.25
=25+2+（0.5-0.25）
=27+0.25
=27.25
=25-0.25+2.5
=25+2.5-0.25
=25+（2+0.5）-0.25
=25+2+（0.5-0.25）
=27+0.25
=27.25
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