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198乘99简便

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

99*99+198=99*99+99*2=99*(99+2)=99*101=9999

99x99+198 =99x99+99+99 =99x(99+1)+99 =9900+99 =9999

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

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

98乘99加198=98x99+2x99=(98+2)x99=100x99=9900

解:原式=(-100+1/99)*198 =-100*198+1/99*198 =-19800+2 =-19798

198+99*99=99*(2+99)=99*(100+1)=990+99=9999 .

198+99=198+(100-1)=198+100-1=298-1=297

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

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