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99.9×98+(1-4/5)×999
简便计算
人气:316 ℃ 时间:2020-04-14 19:15:39
解答

99.9×98+(1-4/5)×999
=99.9×98+0.2×999
=99.9×98+2×99.9
=99.9×(98+2)
=99.9×100
=9990
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