4.5×9.9+0.45怎么简便

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4.5×9.9+0.45怎么简便

4.5×9.9+0.45怎么简便
4.5×9.9+0.45怎么简便

4.5×9.9+0.45怎么简便

=0.45*99+0.45=0.45*(99+1)=45

0.45×99+0.45=(1+99)×0.45=45

4.5(17-0.1)+0.45

4.5*9.9+0.45
=4.5*9.9+4.5*0.1
=4.5*(9.9+0.1)
=4.5

4.5(9.9+0.1)=45