18.23/0.5-3.23/0.5 = 巧算递等式
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人气:445 ℃ 时间:2020-02-04 05:10:32
解答
18.23/0.5-3.23/0.5
=18.23x2-3.25x2
=(18.23-3.23)x2
=15x2
=30
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