9999*0.7+1111*2.7

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9999*0.7+1111*2.7

9999*0.7+1111*2.7
9999*0.7+1111*2.7

9999*0.7+1111*2.7
原式=1111×(9×0.7)+1111×2.7
  =1111×(6.3+2.7)
  =1111×9
  =9999

9999*0.7+1111*2.7=6999.3+2999.7=9999