3.45*102怎么简便

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3.45*102怎么简便

3.45*102
=3.45*(100+2)
=3.45*100+3.45*2
=345+6.9
=351.9

3.45*102
=3.45×(100+2)
=3.45×100+3.45×2
=345+6.9
=351.9

3.45*102?
3.45*(100+2)
3.45*100+3.45*2
345+6.9
351.9