4.9*10.1怎么简便计算?

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4.9*10.1怎么简便计算?4.9*10.1怎么简便计算?4.9*10.1怎么简便计算?4.9*10.1=4.9*(10+0.1)=4.9*10+4.9*0.1=49+0.49=49.49=(5-0

4.9*10.1怎么简便计算?
4.9*10.1怎么简便计算?

4.9*10.1怎么简便计算?
4.9*10.1
=4.9*(10+0.1)
=4.9*10+4.9*0.1
=49+0.49
=49.49

=(5-0.1)*(10+0.1)
=5*10-0.1*10+5*0.1-0.1*0.1
=50-1+0.5-0.01
=49.49