简便计算773+666+227389+499967-399733-(360+233)68+79+132+21.
答案:2 悬赏:30 手机版
解决时间 2021-01-26 15:15
- 提问者网友:浩歌待明月
- 2021-01-26 10:37
简便计算 773+666+227389+499967-399733-(360+233)68+79+132+21.
最佳答案
- 五星知识达人网友:我住北渡口
- 2019-08-15 07:31
解:(1)773+666+227,
=773+227+666,
=1000+666,
=1666;
(2)389+499,
=389+500-1,
=889-1,
=888;
(3)967-399,
=967-400+1,
=567+1,
=568;
(4)733-(360+233),
=733-233-360,
=500-360,
=140;
(5)68+79+132+21,
=(68+132)+(79+21),
=200+100,
=300.解析分析:(1)运用加法交换律解答,(2)依据加法性质解答,(3)(4)依据减法性质解答,(5)运用加法交换律和结合律解答.点评:根据算式中各数据的特点,选择并运用正确简便算法是解答本题的关键.
=773+227+666,
=1000+666,
=1666;
(2)389+499,
=389+500-1,
=889-1,
=888;
(3)967-399,
=967-400+1,
=567+1,
=568;
(4)733-(360+233),
=733-233-360,
=500-360,
=140;
(5)68+79+132+21,
=(68+132)+(79+21),
=200+100,
=300.解析分析:(1)运用加法交换律解答,(2)依据加法性质解答,(3)(4)依据减法性质解答,(5)运用加法交换律和结合律解答.点评:根据算式中各数据的特点,选择并运用正确简便算法是解答本题的关键.
全部回答
- 1楼网友:佘樂
- 2020-02-24 09:47
谢谢了
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