4.5×12.6-0.26×45 怎么简便算法?

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4.5×12.6-0.26×45 怎么简便算法?

4.5×12.6-0.26×45 怎么简便算法?
4.5×12.6-0.26×45 怎么简便算法?

4.5×12.6-0.26×45 怎么简便算法?
4.5×12.6-0.26×45
=4.5×12.6-2.6×4.5
=4.5×(12.6-2.6)
=4.5×10
=45

1.9*4.5+0.45 =1.9*4.5+0.1*4.5 =(1.9+0.1)*4.5 =2*4.5 =9 1.9*4.5+0.45 =1.9*4.5+0.1*4.5 =(1.9+0.1)*