下面各题怎么计算简便就怎么计算.??
9.12+4.5+0.88???
8.43+2.97+0.03
10-2.75-0.25???????
4.9+4.9-0.9-0.9????
5.6+2.7-3.6????
15.25-3.1+0.75-4.9.
下面各题怎么计算简便就怎么计算.??9.12+4.5+0.88???8.43+2.97+0.0310-2.75-0.25???????4.9+4.9-0.9-0.9?
答案:2 悬赏:50 手机版
解决时间 2021-04-07 03:58
- 提问者网友:斑駁影
- 2021-04-06 18:36
最佳答案
- 五星知识达人网友:逃夭
- 2020-06-14 21:38
解:①9.12+4.5+0.88,
=(9.12+0.88)+4.5
=14.5;
②8.43+2.97+0.03,
=8.43+(2.97+0.03),
=8.43+3,
=11.43;
③10-2.75-0.25,
=10-(2.75-0.25),
=10-3,
=7;
④4.9+4.9-0.9-0.9,
=(4.9-0.9)+(4.9-0.9),
=4+4,
=8;
⑤5.6+2.7-3.6,
=(5.6-3.6)+2.7,
=2+2.7,
=4.7;
⑥15.25-3.1+0.75-4.9
=(15.25+0.75)-(3.1+4.9),
=16-8,
=8.解析分析:①②④⑤⑥运用加法的结合律及交换律进行计算,③运用加法的性质进行计算即可.即一个数连续减去2个数,可以用这个数减去这两个数的和.点评:本题考查了学生小数加减法的计算法则及运算定律掌握情况.
=(9.12+0.88)+4.5
=14.5;
②8.43+2.97+0.03,
=8.43+(2.97+0.03),
=8.43+3,
=11.43;
③10-2.75-0.25,
=10-(2.75-0.25),
=10-3,
=7;
④4.9+4.9-0.9-0.9,
=(4.9-0.9)+(4.9-0.9),
=4+4,
=8;
⑤5.6+2.7-3.6,
=(5.6-3.6)+2.7,
=2+2.7,
=4.7;
⑥15.25-3.1+0.75-4.9
=(15.25+0.75)-(3.1+4.9),
=16-8,
=8.解析分析:①②④⑤⑥运用加法的结合律及交换律进行计算,③运用加法的性质进行计算即可.即一个数连续减去2个数,可以用这个数减去这两个数的和.点评:本题考查了学生小数加减法的计算法则及运算定律掌握情况.
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- 1楼网友:白昼之月
- 2019-06-11 09:11
你的回答很对
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