Question

631+82+69怎样简便计算？

Answer 1

先631+69,=700，再700+82=782

Answer 2

631十82十69
二631十69十82
二700十82
＝782

Answer 3

简便方法运算：
631+82+69
=（631+69）+82
=700+82
=782

Answer 4

根据结合律
631+82+69
=（631+69）+82
=700+82
=782

Answer 5

631+82+69的简便计算是
（631+69）+82
=700+82
=782