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0.9乘99加0.9简便计算

0.9+99*0.9=0.9*(1+99)=0.9*100=90

0.9*99+0.9=0.9*99+0.9*1=0.9*100=90

0.9*99+0.9=0.9*(99+1)=90

=0.9乘(99加1)=0.9乘100=90

0.9+99*0.9=0.9+99*0.9+1=(99+1)*0.9=100*0.9=90

90

用简便方法计算五年级6.7乘99加0.96.7乘99加0.9=6.7*(100-1)+0.9=6.7*100-6.7+0.9=670-5.8=664.2

0.9*99+0.9 =0.9*(99+1) (乘法分配律)=0.9*100 =90

0.9*(99+1)=0.9*100=90

=(2000-1)x(1-0.01)x0.9 =(2000-20-1+0.01)x0.9 =1979.01x0.9 =1979.01x1-1979.01x0.1 =1979.01-197.901 =1781.109

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