题目内容
简便计算
| 773+666+227 | 389+499 | 967-399 | 733-(360+233) | 68+79+132+21. |
(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.
=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.
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