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55 99的简便算法

原式=53*(1001)*1/2*50 =1/2*(5300-53)*50 =131175

55x99=55x(100-1)=55x100-55=5500-55=5445

55X99简便计算55*(100-1)=55*100-55=5500-55=5445

55-5=50 99-9=90 50+90=140 140+5+9=154

55*(99+1)

99x55=100x55-55=5500-55=5445

55*99+55=55x(99+1)=55x100=5500 朋友,请【采纳答案】,您的采纳是我答题的动力,谢谢.

5.5*99 +5.5=5.5*(99+1)=5.5*100=550

99x55 =(100-1)x55 =100x55-1x55 =5500-55 =5445

99*55+99=100*55+99-55=5544

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