784070+78407.1+7840.72+784.073+78.407==
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784070+78407.1+7840.72+784.073+78.407==784070+78407.1+7840.72+784.073+78.407==784070+78407.1+7840.72
784070+78407.1+7840.72+784.073+78.407==
784070+78407.1+7840.72+784.073+78.407
=
=
784070+78407.1+7840.72+784.073+78.407==
784070+78407.1+7840.72+784.073+78.407
1.设784070=a,则
原式=a+[(a+1)/10]+[(a+2)/100]+[(a+3)/1000]
+(a/10000)=
(10000a+1000a+1000+100a+200+10a+30+a)/1000
0=
(11111a+1230)/10000
将a=784070代入,得
原式=871180.3