2.14*15.4 0.46*21.4这道题怎么简算?

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2.14*15.40.46*21.4这道题怎么简算?2.14*15.40.46*21.4这道题怎么简算?2.14*15.40.46*21.4这道题怎么简算?2.14*15.4+0.46*21.4=2.

2.14*15.4 0.46*21.4这道题怎么简算?
2.14*15.4 0.46*21.4这道题怎么简算?

2.14*15.4 0.46*21.4这道题怎么简算?
2.14*15.4+0.46*21.4
=2.14×15.4+4.6×2.14
=2.14×(15.4+4.6)
=2.14×20
=42.8