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82.3-40.5\0.81\2.5怎么简便
人气:241 ℃ 时间:2020-03-27 15:42:48
解答
82.3-40.5/0.81/2.5
=82.3-40.5÷(0.81×2.5)
=82.3-40.5÷2.025
=82.3-20
=62.3
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