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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

简便计算,要过程 -99又98/99x198 =(-100+1/99)×198 =-100×198+1/99×198 =-19800+2 =-19798

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

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

99+98+198 =100-1+100-2+200-2 =400-5 =395

498

负99又99分之98乘198 =-(100-99分之1)×198 =-100×198+99分之1×198 =-19800+2 =-19798

198÷2÷99的简便计算怎么做啊! 198/2/99 =99/99 =1 直接计算

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