102*99怎样简便计算
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102*99怎样简便计算
102×99=102×﹙100-1﹚
=10200-102
=10098
102*99=102*100-102=10200-102=10098
102*(100-1)=102*100-102*1=10200-102
102*99
=(100+2)*99
=9900+2*(100-1)
=10100-2
=100098
102×100-102=10098
102*99=(100+2)*(100-1)
=10000+200-100-2
=10100-2
=10098