347乘69加653乘31加306乘19怎么简便运算

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347乘69加653乘31加306乘19怎么简便运算
347乘69加653乘31加306乘19怎么简便运算

347乘69加653乘31加306乘19怎么简便运算
347*69+653*31+306*19
=347*69+(347+306)*31+306*19
=347*69+347*31+306*31+306*19
=347*(69+31)+306*(31+19)
=347*100+306*50
=347*100+153*2*50
=347*100+153*100
=100*(153+347)
=100*500
=50000

347*69+653*31+306*19
=347*69+(347+306)*31+306*19
=347*100+306*50
=694*50+306*50
=50000

347*69+653*31+306*19
=347*31+653*31+306*19+347*38
=1000*31+306*19+694*19
=50000

347*69+653*31+306*19
=347*69+(347+306)*31+306*19
=347*100+306*50
=694*50+306*50
=50000
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