765+654+543+432+321+123+234+345+456+576怎样简便运算,如果有谁知道请告诉我不胜感激提高悬赏

Question

765+654+543+432+321+123+234+345+456+576怎样简便运算,
如果有谁知道
请告诉我
不胜感激
提高悬赏

Answer 1

765+654+543+432+321+123+234+345+456+576
=765+654+123+543+234+432+345+321+456+567
=765+(654+123)+(543+234)+(432+345)+(321+456)+567
=765+777*4+567
=777-12+777*4+777-210
=777*6-222
=111*7*6-111*2
=111*(42-2)
=111*40
=4440