4.19×99+4.9怎么简便计算

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4.19×99+4.9怎么简便计算

4.19×99+4.9怎么简便计算
4.19×99+4.9怎么简便计算

4.19×99+4.9怎么简便计算
应该是4.19×99+4.19
=4.19×(99+1)
=4.19×100
=419

4.19×99+4.9
=4.19*(100-1)+4.9
=4.19*100-4.19+4.9
=419+0.71
=419.71

=4.19×100+4.9-4.19
=419+0.71
=419.71

4.19×100+(4.9-4.19)=419+0.71=419.71