99.9乘以99加99.9简便算

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99.9乘以99加99.9简便算
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99.9乘以99加99.9简便算
99.9乘以99加99.9简便算

99.9乘以99加99.9简便算
99.9乘以(99+1)

法一
=(100-0.1)*(100-1)+99.9
=10000-100-10+0.1+99.9
=10000-10
=9990
法二
=(100-0.1)*99+99.9
=9900+99.9-9.9
=9900+90
=9990
希望回答令你满意哦

99.9*(1+99)=999

99.9*99.+99.9=99.9(99+1)=99.9*100=990