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198加99的简便算法

99×98+198 =99×98+99×2 =99×(98+2) =99×100 =9900

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

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

99²+198+1=99*99+99*2+1=99*99+99+(99+1)=99*(99+1)+100=99*100+100=(99+1)*100=100²=10000

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

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

498

427-99+198 =427-(100-1)+(200-2) =427-100+1+200-2 =427-100+200+1-2 =527+1-2 =526

解:原式=198÷99x34+34 =2x34+34 =34x(2+1) =34x3 =102 分析:直接运算最简便。

你好! 23x198 =23x(200-2) =23x200-23x2 =4600-46 =4554 99x99 99 =(100-1)x(10000-1) =1000000-10000-100+1 =989901 希望可以帮到你请采纳谢谢!

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