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21.5乘以1.9加2.15乘以81 简便运算
人气:145 ℃ 时间:2020-06-13 09:05:53
解答
21.5乘以1.9加2.15乘以81
=21.5×1.9+2.15×81
=2.15×(19+81)
=2.15×100
=215;
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