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19.8/（2.44+4.16）*2.1怎么简算
人气：331 ℃　时间：2020-01-28 17:47:10
解答
19.8*2.1/(2.44+4.16)
=19.8*2.1/6.6
=1.1*18*2.1/(6*1.1)
=18*2.1/6
=3*2.1
=6.3
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