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数学
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19.8乘101减19.8怎样用简便方法计算
人气:337 ℃ 时间:2019-08-20 16:46:05
解答
19.8 * 101 -19.8
= 19.8*(100 +1) -19.8
= 19.8*100 + 19.8 *1 - 19.8
= 1980
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