用简算计算!108×99还有99×101×99

问题描述:

用简算计算!
108×99还有99×101×99

108×99=108×100-108=10800-108=10692
99×101×99
=99×(100+1)×99
=(9900+99)×99
=9999×(100-1)
=999900-9999
=989901

108*99=108*100-108=10800-108=10692
99*101*99=(100-1)*(100+1)*99=(10000-1)*99=990000-99=989901

1:108*(100-1)=10800-108=10692
2:9999*(100-1)=999900-9999=989901

108×99=108*(100-1)=108*100-108=10692
99×101×99=99*(100+1)*(100-1)=99*9999=(100-1)*9999=989901