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简便算法 12.8加2.04乘9.5
人气:131 ℃ 时间:2020-02-05 12:08:58
解答
12.8+2.04*9.5
=12.8+2.04*(10-0.5)
=12.8+2.04*10-2.04*0.5
=12.8+20.4-1.02
=33.2-1.02
=32.18
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