0.9+19.9+299.9+3999.9+49999.9怎么巧算?

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0.9+19.9+299.9+3999.9+49999.9怎么巧算?0.9+19.9+299.9+3999.9+49999.9怎么巧算?0.9+19.9+299.9+3999.9+49999.9怎么巧

0.9+19.9+299.9+3999.9+49999.9怎么巧算?
0.9+19.9+299.9+3999.9+49999.9怎么巧算?

0.9+19.9+299.9+3999.9+49999.9怎么巧算?
0.9+19.9+299.9+3999.9+49999.9
=1+20+300+4000+50000-0.1*5
=54321-0.5
=54320.5

1-0.1+20-0.1+300-0.1+4000-0.1+50000-0.1
=1+20+300+4000+50000-0.5
=54321-0.5
=54320.5
谢谢采纳