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29999+2999+299+29

30000+3000+300+30一4 =33330一4 =33326 答案。

29+299+2999+29999 =(30-1)+(300-1)+(3000-1)+(30000-1) =33330-4 =33326 66x45+22x65 =66x(40+5)+22x(60+5) =66x40+66x5+22x60+22x5 =2640+330+1320+110 =4400

299999+29999+2999+299+29 =300000+30000+3000+300+30-5 =333330-5 =333325

29+299+2999+29999这么 简便计算 29+299+2999+29999 =30+300+3000+30000-1x4 =33330-4 =33326

2.9+29.9+299.9+2999.9+29999.9 =(3-0.1)+(30-0.1)+(300-0.1)+(3000-0.1)+(30000-0.1) =33333-0.5 =33332.5

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