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12.5-12.5X0.2的简便算法
人气:459 ℃ 时间:2020-03-27 10:22:38
解答
12.5-12.5×0.2=
12.5×1-12.5×0.2
=12.5×(1-0.2)
=12.5×0.8
=10
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