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简便计算 (1.9+19%)÷(0.29-190%)
人气:130 ℃ 时间:2020-05-08 15:25:04
解答
(1.9+19%)÷(0.29-190%)
=(190/100+19/100)÷(29/100-190/100)
=209/100*(-100/161)
=-209/161
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