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198加99的简便算法

198+99 =200+100-2-1 =300-3 =297

=100×98-98+198 =9800+100=9900

302×99-198 =302*(100-1)-198 =302*100-302-198 =30200-(302+198) =30200-500 =29700

498

=99×98+98+100 =98×100+100 =100×99 =9900。

198x99+178 =198x(100-1)+178 =19800-198+178 =19800-20 =19780

198十99 =198+100-1 =298-1 =297

297

99×98加198用乘法分配律计算 99×98加198 =99*98+99*2 =99*(98+2) =99*100 =9900

原式=99×98+99×2=99×100=9900。

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