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数学
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599996+49997+3998+407+89=
人气:377 ℃ 时间:2020-02-06 00:42:44
解答
599996+49997+3998+407+89
=(600000-4)+(50000-3)+(4000-2)+(400+7)+(90-1)
=600000+50000+4000+400+90-(4+3+2-7+1)
=654490-3
=654487.
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