347*69+653*31+306*19怎么简便运算

347*(70-1)+653*(30+1)+306*(20-1)
=347*70-347+653*30+653+306*20-306
=347*70+653*30+306*20
=347*20+347*50+653*30+306*20
=(347+306)*20+347*50+653*30
=653*20+653*30+347*50
=653*50+347*50
=(653+347)*50
=1000*50
=50,000

347*(70-1)+653*(30+1)+306*(20-1)
=347*70-347+653*30+653+306*20-306
=347*70+653*30+306*20
=347*20+347*50+653*30+306*20
=(347+306)*20+347*50+653*30
=653*20+653*30+347*50
=653*50+347*50
=(653+347)*50
=1000*50
=50,000

很强，但是用不着，有计算器算就是啦！

用excel一拉，方便的很。