100分之990乘99 用简便算法怎样算

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100分之990乘99 用简便算法怎样算
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100分之990乘99 用简便算法怎样算
100分之990乘99 用简便算法怎样算

100分之990乘99 用简便算法怎样算
990/100*(100-1)
=990/100*100-9.9
=990-9.9
=980.1

(990*100-100+10)/100
(990*100-90)/100

990*99/100
=(1000-10)*(100-1)/100
=(10-1/10)*(100-1)
= 1000-10-10+1/10
=980+1/10
=9801/10

99/100X99=99/100X(100-1)=99/100X100-99/100X1=99-0.99=98.01