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38.2-7.08-20.7-2.22用简便方法计算
还有这种题型17.87-(3.91
7.87)用简便方法计算
人气:180 ℃ 时间:2020-05-27 19:57:17
解答
38.2-7.08-20.7-2.22
=38.2-(7.08+2.22+20.7)
=38.2-(9.3+20.7)
=38.2-30
=8.2
17.87-(3.91+7.87)
=17.87-7.87-3.91
=17-3.91
=13.09
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