用简便方法计算:(要写出计算过程)429+202 278+99  ...
答案:1 悬赏:10 手机版
解决时间 2021-11-17 00:23
- 提问者网友:送舟行
- 2021-11-16 06:13
用简便方法计算:(要写出计算过程)429+202 278+99  ...
最佳答案
- 五星知识达人网友:鱼芗
- 2021-11-16 06:20
(1)429+202
=429+(200+2)
=(429+200)+2
=629+2
=631
(2)278+99
=278+(100-1)
=(278+100)-1
=378-1
=377
(3)582-103
=592-(100+3)
=592-100-3
=492-3
=489
(4)804-397
=804-(400-3)
=804-400+3
=404+3
=407
=429+(200+2)
=(429+200)+2
=629+2
=631
(2)278+99
=278+(100-1)
=(278+100)-1
=378-1
=377
(3)582-103
=592-(100+3)
=592-100-3
=492-3
=489
(4)804-397
=804-(400-3)
=804-400+3
=404+3
=407
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